backend/src/main/java/org/raddatz/familienarchiv/config/AsyncConfig.java

@@ -16,10 +16,10 @@ public class AsyncConfig {
     @Bean
     public Executor taskExecutor() {
         ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
-        executor.setCorePoolSize(1);
-        executor.setMaxPoolSize(1);
-        executor.setQueueCapacity(1);
-        executor.setThreadNamePrefix("Import-");
+        executor.setCorePoolSize(2);
+        executor.setMaxPoolSize(2);
+        executor.setQueueCapacity(10);
+        executor.setThreadNamePrefix("Async-");
         executor.setRejectedExecutionHandler(new ThreadPoolExecutor.AbortPolicy());
         return executor;
     }

backend/src/main/java/org/raddatz/familienarchiv/config/MinioConfig.java

@@ -5,6 +5,7 @@ import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
 import software.amazon.awssdk.regions.Region;
 import software.amazon.awssdk.services.s3.S3Client;
 import software.amazon.awssdk.services.s3.S3Configuration;
+import software.amazon.awssdk.services.s3.presigner.S3Presigner;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.context.annotation.Bean;
@@ -44,6 +45,19 @@ public class MinioConfig {
                 .build();
     }
 
+    @Bean
+    public S3Presigner s3Presigner() {
+        return S3Presigner.builder()
+                .endpointOverride(URI.create(endpoint))
+                .serviceConfiguration(S3Configuration.builder()
+                        .pathStyleAccessEnabled(true)
+                        .build())
+                .region(Region.of(region))
+                .credentialsProvider(StaticCredentialsProvider.create(
+                        AwsBasicCredentials.create(accessKey, secretKey)))
+                .build();
+    }
+
     @Bean
     public CommandLineRunner testS3Connection(S3Client s3Client) {
         return args -> {

backend/src/main/java/org/raddatz/familienarchiv/controller/OcrController.java

@@ -0,0 +1,88 @@
+package org.raddatz.familienarchiv.controller;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.raddatz.familienarchiv.dto.BatchOcrDTO;
+import org.raddatz.familienarchiv.dto.OcrStatusDTO;
+import org.raddatz.familienarchiv.dto.TriggerOcrDTO;
+import org.raddatz.familienarchiv.model.AppUser;
+import org.raddatz.familienarchiv.model.OcrJob;
+import org.raddatz.familienarchiv.security.Permission;
+import org.raddatz.familienarchiv.security.RequirePermission;
+import org.raddatz.familienarchiv.service.OcrBatchService;
+import org.raddatz.familienarchiv.service.OcrProgressService;
+import org.raddatz.familienarchiv.service.OcrService;
+import org.raddatz.familienarchiv.service.UserService;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
+
+import jakarta.validation.Valid;
+import java.util.Map;
+import java.util.UUID;
+
+@RestController
+@RequiredArgsConstructor
+@Slf4j
+public class OcrController {
+
+    private final OcrService ocrService;
+    private final OcrBatchService ocrBatchService;
+    private final OcrProgressService ocrProgressService;
+    private final UserService userService;
+
+    @PostMapping("/api/documents/{documentId}/ocr")
+    @ResponseStatus(HttpStatus.ACCEPTED)
+    @RequirePermission(Permission.WRITE_ALL)
+    public Map<String, UUID> triggerOcr(
+            @PathVariable UUID documentId,
+            @RequestBody TriggerOcrDTO dto,
+            Authentication authentication) {
+        UUID userId = resolveUserId(authentication);
+        UUID jobId = ocrService.startOcr(documentId, dto.getScriptType(), userId);
+        return Map.of("jobId", jobId);
+    }
+
+    @PostMapping("/api/ocr/batch")
+    @ResponseStatus(HttpStatus.ACCEPTED)
+    @RequirePermission(Permission.ADMIN)
+    public Map<String, UUID> triggerBatch(
+            @RequestBody @Valid BatchOcrDTO dto,
+            Authentication authentication) {
+        UUID userId = resolveUserId(authentication);
+        UUID jobId = ocrBatchService.startBatch(dto.getDocumentIds(), userId);
+        return Map.of("jobId", jobId);
+    }
+
+    @GetMapping("/api/ocr/jobs/{jobId}")
+    @RequirePermission(Permission.READ_ALL)
+    public OcrJob getJobStatus(@PathVariable UUID jobId) {
+        return ocrService.getJob(jobId);
+    }
+
+    @GetMapping(value = "/api/ocr/jobs/{jobId}/progress", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
+    @RequirePermission(Permission.READ_ALL)
+    public SseEmitter streamProgress(@PathVariable UUID jobId) {
+        ocrService.getJob(jobId);
+        return ocrProgressService.register(jobId);
+    }
+
+    @GetMapping("/api/documents/{documentId}/ocr-status")
+    @RequirePermission(Permission.READ_ALL)
+    public OcrStatusDTO getDocumentOcrStatus(@PathVariable UUID documentId) {
+        return ocrService.getDocumentOcrStatus(documentId);
+    }
+
+    private UUID resolveUserId(Authentication authentication) {
+        if (authentication == null || !authentication.isAuthenticated()) return null;
+        try {
+            AppUser user = userService.findByUsername(authentication.getName());
+            return user != null ? user.getId() : null;
+        } catch (Exception e) {
+            log.warn("Failed to resolve user ID for authentication: {}", authentication.getName(), e);
+            return null;
+        }
+    }
+}

backend/src/main/java/org/raddatz/familienarchiv/controller/TranscriptionBlockController.java

@@ -81,6 +81,14 @@ public class TranscriptionBlockController {
         return transcriptionService.listBlocks(documentId);
     }
 
+    @PutMapping("/{blockId}/review")
+    @RequirePermission(Permission.WRITE_ALL)
+    public TranscriptionBlock reviewBlock(
+            @PathVariable UUID documentId,
+            @PathVariable UUID blockId) {
+        return transcriptionService.reviewBlock(documentId, blockId);
+    }
+
     @GetMapping("/{blockId}/history")
     @RequirePermission(Permission.READ_ALL)
     public List<TranscriptionBlockVersion> getBlockHistory(

backend/src/main/java/org/raddatz/familienarchiv/dto/BatchOcrDTO.java

@@ -0,0 +1,19 @@
+package org.raddatz.familienarchiv.dto;
+
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.Size;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+import java.util.UUID;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class BatchOcrDTO {
+    @NotEmpty
+    @Size(max = 500, message = "batch size must not exceed 500 documents")
+    private List<UUID> documentIds;
+}

backend/src/main/java/org/raddatz/familienarchiv/dto/CreateAnnotationDTO.java

@@ -1,9 +1,15 @@
 package org.raddatz.familienarchiv.dto;
 
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.DecimalMax;
+import jakarta.validation.constraints.DecimalMin;
+import jakarta.validation.constraints.Size;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
+import java.util.List;
+
 @Data
 @NoArgsConstructor
 @AllArgsConstructor
@@ -14,4 +20,19 @@ public class CreateAnnotationDTO {
     private double width;
     private double height;
     private String color;
+
+    @Size(min = 4, max = 4, message = "polygon must have exactly 4 points")
+    @UniquePoints
+    @Valid
+    private List<@Size(min = 2, max = 2, message = "each point must have exactly 2 coordinates")
+                 List<@DecimalMin("0.0") @DecimalMax("1.0") Double>> polygon;
+
+    public CreateAnnotationDTO(int pageNumber, double x, double y, double width, double height, String color) {
+        this.pageNumber = pageNumber;
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+        this.color = color;
+    }
 }

backend/src/main/java/org/raddatz/familienarchiv/dto/DocumentUpdateDTO.java

@@ -5,6 +5,7 @@ import java.util.List;
 import java.util.UUID;
 
 import lombok.Data;
+import org.raddatz.familienarchiv.model.ScriptType;
 
 @Data
 public class DocumentUpdateDTO {
@@ -18,4 +19,5 @@ public class DocumentUpdateDTO {
     private List<UUID> receiverIds;
     private String tags;
     private Boolean metadataComplete;
+    private ScriptType scriptType;
 }

backend/src/main/java/org/raddatz/familienarchiv/dto/OcrStatusDTO.java

@@ -0,0 +1,19 @@
+package org.raddatz.familienarchiv.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.UUID;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class OcrStatusDTO {
+    private String status;
+    private UUID jobId;
+    private int currentPage;
+    private int totalPages;
+}

backend/src/main/java/org/raddatz/familienarchiv/dto/TriggerOcrDTO.java

@@ -0,0 +1,13 @@
+package org.raddatz.familienarchiv.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.raddatz.familienarchiv.model.ScriptType;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class TriggerOcrDTO {
+    private ScriptType scriptType;
+}

backend/src/main/java/org/raddatz/familienarchiv/dto/UniquePoints.java

@@ -0,0 +1,16 @@
+package org.raddatz.familienarchiv.dto;
+
+import jakarta.validation.Constraint;
+import jakarta.validation.Payload;
+
+import java.lang.annotation.*;
+
+@Documented
+@Constraint(validatedBy = UniquePointsValidator.class)
+@Target({ElementType.FIELD})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface UniquePoints {
+    String message() default "polygon must contain 4 unique points";
+    Class<?>[] groups() default {};
+    Class<? extends Payload>[] payload() default {};
+}

backend/src/main/java/org/raddatz/familienarchiv/dto/UniquePointsValidator.java

@@ -0,0 +1,16 @@
+package org.raddatz.familienarchiv.dto;
+
+import jakarta.validation.ConstraintValidator;
+import jakarta.validation.ConstraintValidatorContext;
+
+import java.util.HashSet;
+import java.util.List;
+
+public class UniquePointsValidator implements ConstraintValidator<UniquePoints, List<List<Double>>> {
+
+    @Override
+    public boolean isValid(List<List<Double>> polygon, ConstraintValidatorContext context) {
+        if (polygon == null) return true;
+        return new HashSet<>(polygon).size() == polygon.size();
+    }
+}

backend/src/main/java/org/raddatz/familienarchiv/exception/ErrorCode.java

@@ -66,6 +66,16 @@ public enum ErrorCode {
     /** The notification with the given ID does not exist. 404 */
     NOTIFICATION_NOT_FOUND,
 
+    // --- OCR ---
+    /** The OCR service is not available or not healthy. 503 */
+    OCR_SERVICE_UNAVAILABLE,
+    /** The OCR job with the given ID does not exist. 404 */
+    OCR_JOB_NOT_FOUND,
+    /** The document is not in UPLOADED status and cannot be OCR'd. 400 */
+    OCR_DOCUMENT_NOT_UPLOADED,
+    /** OCR processing failed for the document. 500 */
+    OCR_PROCESSING_FAILED,
+
     // --- Generic ---
     /** Request validation failed (missing or malformed fields). 400 */
     VALIDATION_ERROR,

backend/src/main/java/org/raddatz/familienarchiv/model/BlockSource.java

@@ -0,0 +1,6 @@
+package org.raddatz.familienarchiv.model;
+
+public enum BlockSource {
+    MANUAL,
+    OCR
+}

backend/src/main/java/org/raddatz/familienarchiv/model/Document.java

@@ -91,6 +91,12 @@ public class Document {
     @Builder.Default
     private boolean metadataComplete = false;
 
+    @Enumerated(EnumType.STRING)
+    @Column(name = "script_type", nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    @Builder.Default
+    private ScriptType scriptType = ScriptType.UNKNOWN;
+
     @ManyToMany(fetch = FetchType.EAGER)
     @JoinTable(name = "document_receivers", joinColumns = @JoinColumn(name = "document_id"), inverseJoinColumns = @JoinColumn(name = "person_id"))
     @Builder.Default

backend/src/main/java/org/raddatz/familienarchiv/model/DocumentAnnotation.java

@@ -4,8 +4,11 @@ import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.persistence.*;
 import lombok.*;
 import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.JdbcTypeCode;
+import org.hibernate.type.SqlTypes;
 
 import java.time.LocalDateTime;
+import java.util.List;
 import java.util.UUID;
 
 @Entity
@@ -52,6 +55,10 @@ public class DocumentAnnotation {
     @Column(name = "file_hash", length = 64)
     private String fileHash;
 
+    @JdbcTypeCode(SqlTypes.JSON)
+    @Column(columnDefinition = "jsonb")
+    private List<List<Double>> polygon;
+
     @Column(name = "created_by")
     private UUID createdBy;
 

backend/src/main/java/org/raddatz/familienarchiv/model/OcrDocumentStatus.java

@@ -0,0 +1,9 @@
+package org.raddatz.familienarchiv.model;
+
+public enum OcrDocumentStatus {
+    PENDING,
+    RUNNING,
+    DONE,
+    FAILED,
+    SKIPPED
+}

backend/src/main/java/org/raddatz/familienarchiv/model/OcrJob.java

@@ -0,0 +1,65 @@
+package org.raddatz.familienarchiv.model;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.persistence.*;
+import lombok.*;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Entity
+@Table(name = "ocr_jobs")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class OcrJob {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.UUID)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    private UUID id;
+
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    @Builder.Default
+    private OcrJobStatus status = OcrJobStatus.PENDING;
+
+    @Column(name = "total_documents", nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    private int totalDocuments;
+
+    @Column(name = "processed_documents", nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    @Builder.Default
+    private int processedDocuments = 0;
+
+    @Column(name = "error_count", nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    @Builder.Default
+    private int errorCount = 0;
+
+    @Column(name = "skipped_count", nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    @Builder.Default
+    private int skippedCount = 0;
+
+    @Column(name = "progress_message")
+    private String progressMessage;
+
+    @Column(name = "created_by")
+    private UUID createdBy;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    @CreationTimestamp
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at", nullable = false)
+    @UpdateTimestamp
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    private LocalDateTime updatedAt;
+}

backend/src/main/java/org/raddatz/familienarchiv/model/OcrJobDocument.java

@@ -0,0 +1,59 @@
+package org.raddatz.familienarchiv.model;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.persistence.*;
+import lombok.*;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Entity
+@Table(name = "ocr_job_documents")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class OcrJobDocument {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.UUID)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    private UUID id;
+
+    @Column(name = "job_id", nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    private UUID jobId;
+
+    @Column(name = "document_id", nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    private UUID documentId;
+
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    @Builder.Default
+    private OcrDocumentStatus status = OcrDocumentStatus.PENDING;
+
+    @Column(name = "error_message")
+    private String errorMessage;
+
+    @Column(name = "current_page")
+    @Builder.Default
+    private int currentPage = 0;
+
+    @Column(name = "total_pages")
+    @Builder.Default
+    private int totalPages = 0;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    @CreationTimestamp
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at", nullable = false)
+    @UpdateTimestamp
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    private LocalDateTime updatedAt;
+}

backend/src/main/java/org/raddatz/familienarchiv/model/OcrJobStatus.java

@@ -0,0 +1,8 @@
+package org.raddatz.familienarchiv.model;
+
+public enum OcrJobStatus {
+    PENDING,
+    RUNNING,
+    DONE,
+    FAILED
+}

backend/src/main/java/org/raddatz/familienarchiv/model/PolygonConverter.java

@@ -0,0 +1,36 @@
+package org.raddatz.familienarchiv.model;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+
+import java.util.List;
+
+@Converter
+public class PolygonConverter implements AttributeConverter<List<List<Double>>, String> {
+
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+    private static final TypeReference<List<List<Double>>> TYPE_REF = new TypeReference<>() {};
+
+    @Override
+    public String convertToDatabaseColumn(List<List<Double>> polygon) {
+        if (polygon == null) return null;
+        try {
+            return MAPPER.writeValueAsString(polygon);
+        } catch (JsonProcessingException e) {
+            throw new IllegalArgumentException("Failed to serialize polygon", e);
+        }
+    }
+
+    @Override
+    public List<List<Double>> convertToEntityAttribute(String json) {
+        if (json == null || json.isEmpty()) return null;
+        try {
+            return MAPPER.readValue(json, TYPE_REF);
+        } catch (JsonProcessingException e) {
+            throw new IllegalArgumentException("Failed to deserialize polygon", e);
+        }
+    }
+}

backend/src/main/java/org/raddatz/familienarchiv/model/ScriptType.java

@@ -0,0 +1,8 @@
+package org.raddatz.familienarchiv.model;
+
+public enum ScriptType {
+    UNKNOWN,
+    TYPEWRITER,
+    HANDWRITING_LATIN,
+    HANDWRITING_KURRENT
+}

backend/src/main/java/org/raddatz/familienarchiv/model/TranscriptionBlock.java

@@ -41,6 +41,17 @@ public class TranscriptionBlock {
     @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
     private int sortOrder;
 
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false, length = 10)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    @Builder.Default
+    private BlockSource source = BlockSource.MANUAL;
+
+    @Column(nullable = false)
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+    @Builder.Default
+    private boolean reviewed = false;
+
     @Version
     @Column(nullable = false)
     @Schema(requiredMode = Schema.RequiredMode.REQUIRED)

backend/src/main/java/org/raddatz/familienarchiv/repository/OcrJobDocumentRepository.java

@@ -0,0 +1,20 @@
+package org.raddatz.familienarchiv.repository;
+
+import org.raddatz.familienarchiv.model.OcrDocumentStatus;
+import org.raddatz.familienarchiv.model.OcrJobDocument;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface OcrJobDocumentRepository extends JpaRepository<OcrJobDocument, UUID> {
+
+    List<OcrJobDocument> findByJobIdOrderByCreatedAtAsc(UUID jobId);
+
+    List<OcrJobDocument> findByJobIdAndStatus(UUID jobId, OcrDocumentStatus status);
+
+    Optional<OcrJobDocument> findByJobIdAndDocumentId(UUID jobId, UUID documentId);
+
+    Optional<OcrJobDocument> findFirstByDocumentIdAndStatusIn(UUID documentId, List<OcrDocumentStatus> statuses);
+}

backend/src/main/java/org/raddatz/familienarchiv/repository/OcrJobRepository.java

@@ -0,0 +1,9 @@
+package org.raddatz.familienarchiv.repository;
+
+import org.raddatz.familienarchiv.model.OcrJob;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.UUID;
+
+public interface OcrJobRepository extends JpaRepository<OcrJob, UUID> {
+}

backend/src/main/java/org/raddatz/familienarchiv/service/AnnotationService.java

@@ -48,6 +48,26 @@ public class AnnotationService {
         return annotationRepository.save(annotation);
     }
 
+    @Transactional
+    public DocumentAnnotation createOcrAnnotation(UUID documentId, CreateAnnotationDTO dto,
+                                                   UUID userId, String fileHash,
+                                                   List<List<Double>> polygon) {
+        DocumentAnnotation annotation = DocumentAnnotation.builder()
+                .documentId(documentId)
+                .pageNumber(dto.getPageNumber())
+                .x(dto.getX())
+                .y(dto.getY())
+                .width(dto.getWidth())
+                .height(dto.getHeight())
+                .color(dto.getColor())
+                .fileHash(fileHash)
+                .createdBy(userId)
+                .polygon(polygon)
+                .build();
+
+        return annotationRepository.save(annotation);
+    }
+
     @Transactional
     public void deleteAnnotation(UUID documentId, UUID annotationId, UUID userId) {
         DocumentAnnotation annotation = annotationRepository

backend/src/main/java/org/raddatz/familienarchiv/service/DocumentService.java

@@ -8,6 +8,7 @@ import org.raddatz.familienarchiv.dto.IncompleteDocumentDTO;
 import org.raddatz.familienarchiv.model.Document;
 import org.raddatz.familienarchiv.dto.DocumentSort;
 import org.raddatz.familienarchiv.model.DocumentStatus;
+import org.raddatz.familienarchiv.model.ScriptType;
 import org.raddatz.familienarchiv.model.Person;
 import org.raddatz.familienarchiv.model.Tag;
 import org.raddatz.familienarchiv.repository.DocumentRepository;
@@ -222,6 +223,10 @@ public class DocumentService {
             doc.setMetadataComplete(dto.getMetadataComplete());
         }
 
+        if (dto.getScriptType() != null) {
+            doc.setScriptType(dto.getScriptType());
+        }
+
         // 4. Datei austauschen (nur wenn eine neue ausgewählt wurde)
         if (newFile != null && !newFile.isEmpty()) {
             FileService.UploadResult upload = fileService.uploadFile(newFile, newFile.getOriginalFilename());
@@ -373,6 +378,13 @@ public class DocumentService {
         return documentRepository.findAll(conversation, Sort.by(Sort.Direction.ASC, "documentDate"));
     }
 
+    @Transactional
+    public void updateScriptType(UUID documentId, ScriptType scriptType) {
+        Document doc = getDocumentById(documentId);
+        doc.setScriptType(scriptType);
+        documentRepository.save(doc);
+    }
+
     public Document getDocumentById(UUID id) {
         return documentRepository.findById(id)
                 .orElseThrow(() -> DomainException.notFound(ErrorCode.DOCUMENT_NOT_FOUND, "Document not found: " + id));

backend/src/main/java/org/raddatz/familienarchiv/service/FileService.java

@@ -4,6 +4,8 @@ import software.amazon.awssdk.core.ResponseInputStream;
 import software.amazon.awssdk.core.sync.RequestBody;
 import software.amazon.awssdk.services.s3.S3Client;
 import software.amazon.awssdk.services.s3.model.*;
+import software.amazon.awssdk.services.s3.presigner.S3Presigner;
+import software.amazon.awssdk.services.s3.presigner.model.GetObjectPresignRequest;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -16,6 +18,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+import java.time.Duration;
 import java.util.UUID;
 
 @Service
@@ -24,10 +27,13 @@ public class FileService {
     private static final Logger log = LoggerFactory.getLogger(FileService.class);
 
     private final S3Client s3Client;
+    private final S3Presigner s3Presigner;
     private final String bucketName;
 
-    public FileService(S3Client s3Client, @Value("${app.s3.bucket}") String bucketName) {
+    public FileService(S3Client s3Client, S3Presigner s3Presigner,
+                       @Value("${app.s3.bucket}") String bucketName) {
         this.s3Client = s3Client;
+        this.s3Presigner = s3Presigner;
         this.bucketName = bucketName;
     }
 
@@ -106,6 +112,24 @@ public class FileService {
         }
     }
 
+    /**
+     * Generates a presigned URL for downloading an object from S3/MinIO.
+     * Valid for 15 minutes — enough for OCR processing on CPU.
+     */
+    public String generatePresignedUrl(String s3Key) {
+        GetObjectRequest getObjectRequest = GetObjectRequest.builder()
+                .bucket(bucketName)
+                .key(s3Key)
+                .build();
+
+        GetObjectPresignRequest presignRequest = GetObjectPresignRequest.builder()
+                .signatureDuration(Duration.ofMinutes(15))
+                .getObjectRequest(getObjectRequest)
+                .build();
+
+        return s3Presigner.presignGetObject(presignRequest).url().toString();
+    }
+
     // ─── private helpers ──────────────────────────────────────────────────────
 
     private static String sha256Hex(byte[] bytes) {

backend/src/main/java/org/raddatz/familienarchiv/service/OcrAsyncRunner.java

@@ -0,0 +1,217 @@
+package org.raddatz.familienarchiv.service;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.raddatz.familienarchiv.dto.CreateAnnotationDTO;
+import org.raddatz.familienarchiv.model.*;
+import org.raddatz.familienarchiv.repository.OcrJobDocumentRepository;
+import org.raddatz.familienarchiv.repository.OcrJobRepository;
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicInteger;
+
+@Component
+@RequiredArgsConstructor
+@Slf4j
+public class OcrAsyncRunner {
+
+    private static final String OCR_ANNOTATION_COLOR = "#00C7B1";
+
+    private final OcrClient ocrClient;
+    private final DocumentService documentService;
+    private final TranscriptionService transcriptionService;
+    private final AnnotationService annotationService;
+    private final FileService fileService;
+    private final OcrJobRepository ocrJobRepository;
+    private final OcrJobDocumentRepository ocrJobDocumentRepository;
+    private final OcrProgressService ocrProgressService;
+
+    @Async
+    public void runSingleDocument(UUID jobId, UUID documentId, UUID userId) {
+        OcrJob job = ocrJobRepository.findById(jobId).orElse(null);
+        if (job == null) return;
+
+        job.setStatus(OcrJobStatus.RUNNING);
+        updateProgress(job, "PREPARING");
+
+        OcrJobDocument jobDoc = ocrJobDocumentRepository.findByJobIdAndDocumentId(jobId, documentId)
+                .orElse(null);
+        if (jobDoc != null) {
+            jobDoc.setStatus(OcrDocumentStatus.RUNNING);
+            ocrJobDocumentRepository.save(jobDoc);
+        }
+
+        Document doc = documentService.getDocumentById(documentId);
+
+        try {
+            updateProgress(job, "LOADING");
+            clearExistingBlocks(documentId);
+            String pdfUrl = fileService.generatePresignedUrl(doc.getFilePath());
+
+            AtomicInteger blockCounter = new AtomicInteger(0);
+            AtomicInteger currentPage = new AtomicInteger(0);
+            AtomicInteger skippedPages = new AtomicInteger(0);
+            AtomicInteger totalPages = new AtomicInteger(0);
+
+            ocrClient.streamBlocks(pdfUrl, doc.getScriptType(), event -> {
+                switch (event) {
+                    case OcrStreamEvent.Start start -> {
+                        totalPages.set(start.totalPages());
+                        if (jobDoc != null) {
+                            jobDoc.setTotalPages(start.totalPages());
+                            ocrJobDocumentRepository.save(jobDoc);
+                        }
+                    }
+                    case OcrStreamEvent.Page page -> {
+                        for (OcrBlockResult block : page.blocks()) {
+                            createSingleBlock(documentId, block, userId,
+                                    doc.getFileHash(), blockCounter.getAndIncrement());
+                        }
+                        currentPage.incrementAndGet();
+                        if (jobDoc != null) {
+                            jobDoc.setCurrentPage(currentPage.get());
+                            ocrJobDocumentRepository.save(jobDoc);
+                        }
+                        updateProgress(job, "ANALYZING_PAGE:" + currentPage.get()
+                                + ":" + totalPages.get() + ":" + blockCounter.get());
+                    }
+                    case OcrStreamEvent.Error error -> {
+                        log.warn("OCR page {} failed for document {}: {}",
+                                error.pageNumber(), documentId, error.message());
+                        skippedPages.incrementAndGet();
+                        currentPage.incrementAndGet();
+                        if (jobDoc != null) {
+                            jobDoc.setCurrentPage(currentPage.get());
+                            ocrJobDocumentRepository.save(jobDoc);
+                        }
+                    }
+                    case OcrStreamEvent.Done done -> {
+                        if (jobDoc != null) {
+                            jobDoc.setCurrentPage(totalPages.get());
+                            ocrJobDocumentRepository.save(jobDoc);
+                        }
+                    }
+                }
+            });
+
+            job.setStatus(OcrJobStatus.DONE);
+            job.setProcessedDocuments(1);
+            updateProgress(job, "DONE:" + blockCounter.get() + ":" + skippedPages.get());
+            if (jobDoc != null) {
+                jobDoc.setStatus(OcrDocumentStatus.DONE);
+                ocrJobDocumentRepository.save(jobDoc);
+            }
+        } catch (Exception e) {
+            log.error("OCR processing failed for document {}", documentId, e);
+            job.setStatus(OcrJobStatus.FAILED);
+            job.setErrorCount(1);
+            updateProgress(job, "ERROR");
+            if (jobDoc != null) {
+                jobDoc.setStatus(OcrDocumentStatus.FAILED);
+                jobDoc.setErrorMessage(e.getMessage());
+                ocrJobDocumentRepository.save(jobDoc);
+            }
+        }
+    }
+
+    private void updateProgress(OcrJob job, String message) {
+        job.setProgressMessage(message);
+        ocrJobRepository.save(job);
+    }
+
+    @Async
+    public void runBatch(UUID jobId, UUID userId) {
+        OcrJob job = ocrJobRepository.findById(jobId).orElse(null);
+        if (job == null) return;
+
+        job.setStatus(OcrJobStatus.RUNNING);
+        ocrJobRepository.save(job);
+
+        List<OcrJobDocument> jobDocs = ocrJobDocumentRepository.findByJobIdOrderByCreatedAtAsc(jobId);
+
+        for (OcrJobDocument jobDoc : jobDocs) {
+            Document doc = documentService.getDocumentById(jobDoc.getDocumentId());
+
+            if (doc.getStatus() == DocumentStatus.PLACEHOLDER) {
+                jobDoc.setStatus(OcrDocumentStatus.SKIPPED);
+                ocrJobDocumentRepository.save(jobDoc);
+                job.setSkippedCount(job.getSkippedCount() + 1);
+                ocrJobRepository.save(job);
+                ocrProgressService.emit(jobId, "document", Map.of(
+                        "documentId", jobDoc.getDocumentId(),
+                        "status", "SKIPPED",
+                        "processed", job.getProcessedDocuments(),
+                        "total", job.getTotalDocuments()));
+                continue;
+            }
+
+            jobDoc.setStatus(OcrDocumentStatus.RUNNING);
+            ocrJobDocumentRepository.save(jobDoc);
+
+            try {
+                processDocument(jobDoc.getDocumentId(), doc, userId);
+                jobDoc.setStatus(OcrDocumentStatus.DONE);
+                job.setProcessedDocuments(job.getProcessedDocuments() + 1);
+            } catch (Exception e) {
+                log.error("OCR batch: failed document {}", jobDoc.getDocumentId(), e);
+                jobDoc.setStatus(OcrDocumentStatus.FAILED);
+                jobDoc.setErrorMessage(e.getMessage());
+                job.setErrorCount(job.getErrorCount() + 1);
+            }
+
+            ocrJobDocumentRepository.save(jobDoc);
+            ocrJobRepository.save(job);
+
+            ocrProgressService.emit(jobId, "document", Map.of(
+                    "documentId", jobDoc.getDocumentId(),
+                    "status", jobDoc.getStatus().name(),
+                    "processed", job.getProcessedDocuments(),
+                    "total", job.getTotalDocuments()));
+        }
+
+        job.setStatus(OcrJobStatus.DONE);
+        ocrJobRepository.save(job);
+
+        ocrProgressService.emit(jobId, "done", Map.of(
+                "processed", job.getProcessedDocuments(),
+                "errors", job.getErrorCount(),
+                "skipped", job.getSkippedCount()));
+        ocrProgressService.complete(jobId);
+    }
+
+    void processDocument(UUID documentId, Document doc, UUID userId) {
+        clearExistingBlocks(documentId);
+
+        String pdfUrl = fileService.generatePresignedUrl(doc.getFilePath());
+        List<OcrBlockResult> blocks = ocrClient.extractBlocks(pdfUrl, doc.getScriptType());
+        createTranscriptionBlocks(documentId, blocks, userId, doc.getFileHash());
+    }
+
+    private void clearExistingBlocks(UUID documentId) {
+        transcriptionService.deleteAllBlocksByDocument(documentId);
+    }
+
+    private void createTranscriptionBlocks(UUID documentId, List<OcrBlockResult> blocks,
+                                            UUID userId, String fileHash) {
+        for (int i = 0; i < blocks.size(); i++) {
+            createSingleBlock(documentId, blocks.get(i), userId, fileHash, i);
+        }
+    }
+
+    void createSingleBlock(UUID documentId, OcrBlockResult block,
+                           UUID userId, String fileHash, int sortOrder) {
+        CreateAnnotationDTO annotationDTO = new CreateAnnotationDTO(
+                block.pageNumber(), block.x(), block.y(),
+                block.width(), block.height(), OCR_ANNOTATION_COLOR);
+
+        DocumentAnnotation annotation = annotationService.createOcrAnnotation(
+                documentId, annotationDTO, userId, fileHash, block.polygon());
+
+        transcriptionService.createOcrBlock(documentId, annotation.getId(),
+                block.text(), sortOrder, userId);
+    }
+}

backend/src/main/java/org/raddatz/familienarchiv/service/OcrBatchService.java

@@ -0,0 +1,50 @@
+package org.raddatz.familienarchiv.service;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.raddatz.familienarchiv.exception.DomainException;
+import org.raddatz.familienarchiv.exception.ErrorCode;
+import org.raddatz.familienarchiv.model.*;
+import org.raddatz.familienarchiv.repository.OcrJobDocumentRepository;
+import org.raddatz.familienarchiv.repository.OcrJobRepository;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.UUID;
+
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class OcrBatchService {
+
+    private final OcrHealthClient ocrHealthClient;
+    private final OcrJobRepository ocrJobRepository;
+    private final OcrJobDocumentRepository ocrJobDocumentRepository;
+    private final OcrAsyncRunner ocrAsyncRunner;
+
+    public UUID startBatch(List<UUID> documentIds, UUID userId) {
+        if (!ocrHealthClient.isHealthy()) {
+            throw DomainException.internal(ErrorCode.OCR_SERVICE_UNAVAILABLE,
+                    "OCR service is not available");
+        }
+
+        OcrJob job = OcrJob.builder()
+                .totalDocuments(documentIds.size())
+                .createdBy(userId)
+                .status(OcrJobStatus.PENDING)
+                .build();
+        job = ocrJobRepository.save(job);
+
+        for (UUID docId : documentIds) {
+            OcrJobDocument jobDoc = OcrJobDocument.builder()
+                    .jobId(job.getId())
+                    .documentId(docId)
+                    .status(OcrDocumentStatus.PENDING)
+                    .build();
+            ocrJobDocumentRepository.save(jobDoc);
+        }
+
+        ocrAsyncRunner.runBatch(job.getId(), userId);
+        return job.getId();
+    }
+}

backend/src/main/java/org/raddatz/familienarchiv/service/OcrBlockResult.java

@@ -0,0 +1,16 @@
+package org.raddatz.familienarchiv.service;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
+import java.util.List;
+
+@JsonIgnoreProperties(ignoreUnknown = true)
+public record OcrBlockResult(
+        int pageNumber,
+        double x,
+        double y,
+        double width,
+        double height,
+        List<List<Double>> polygon,
+        String text
+) {}

backend/src/main/java/org/raddatz/familienarchiv/service/OcrClient.java

@@ -0,0 +1,35 @@
+package org.raddatz.familienarchiv.service;
+
+import org.raddatz.familienarchiv.model.ScriptType;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.function.Consumer;
+
+public interface OcrClient {
+    List<OcrBlockResult> extractBlocks(String pdfUrl, ScriptType scriptType);
+
+    /**
+     * Stream OCR results page-by-page via NDJSON. Implementations should override
+     * this method. The default exists only for backward compatibility during migration
+     * — it calls extractBlocks() and synthesizes events from the collected result.
+     */
+    default void streamBlocks(String pdfUrl, ScriptType scriptType, Consumer<OcrStreamEvent> handler) {
+        List<OcrBlockResult> allBlocks = extractBlocks(pdfUrl, scriptType);
+
+        LinkedHashMap<Integer, List<OcrBlockResult>> byPage = new LinkedHashMap<>();
+        for (OcrBlockResult block : allBlocks) {
+            byPage.computeIfAbsent(block.pageNumber(), k -> new ArrayList<>()).add(block);
+        }
+
+        int totalPages = byPage.isEmpty() ? 0 : byPage.keySet().stream().mapToInt(i -> i).max().orElse(0) + 1;
+        handler.accept(new OcrStreamEvent.Start(totalPages));
+
+        for (var entry : byPage.entrySet()) {
+            handler.accept(new OcrStreamEvent.Page(entry.getKey(), entry.getValue()));
+        }
+
+        handler.accept(new OcrStreamEvent.Done(allBlocks.size(), 0));
+    }
+}

backend/src/main/java/org/raddatz/familienarchiv/service/OcrHealthClient.java

@@ -0,0 +1,5 @@
+package org.raddatz.familienarchiv.service;
+
+public interface OcrHealthClient {
+    boolean isHealthy();
+}

backend/src/main/java/org/raddatz/familienarchiv/service/OcrProgressService.java

@@ -0,0 +1,69 @@
+package org.raddatz.familienarchiv.service;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+@Service
+@Slf4j
+public class OcrProgressService {
+
+    private static final long SSE_TIMEOUT = 5 * 60 * 1000L;
+
+    private final ConcurrentHashMap<UUID, List<SseEmitter>> emitters = new ConcurrentHashMap<>();
+
+    public SseEmitter register(UUID jobId) {
+        SseEmitter emitter = new SseEmitter(SSE_TIMEOUT);
+        emitters.computeIfAbsent(jobId, k -> new CopyOnWriteArrayList<>()).add(emitter);
+
+        emitter.onCompletion(() -> removeEmitter(jobId, emitter));
+        emitter.onTimeout(() -> removeEmitter(jobId, emitter));
+        emitter.onError(e -> removeEmitter(jobId, emitter));
+
+        return emitter;
+    }
+
+    public void emit(UUID jobId, String eventType, Object data) {
+        List<SseEmitter> jobEmitters = emitters.get(jobId);
+        if (jobEmitters == null) return;
+
+        for (SseEmitter emitter : jobEmitters) {
+            try {
+                emitter.send(SseEmitter.event().name(eventType).data(data));
+            } catch (IOException e) {
+                log.debug("SSE send failed for job {} — removing emitter", jobId);
+                removeEmitter(jobId, emitter);
+            }
+        }
+    }
+
+    public void complete(UUID jobId) {
+        List<SseEmitter> jobEmitters = emitters.remove(jobId);
+        if (jobEmitters == null) return;
+
+        for (SseEmitter emitter : jobEmitters) {
+            try {
+                emitter.complete();
+            } catch (Exception e) {
+                log.debug("SSE complete failed for job {}", jobId);
+            }
+        }
+    }
+
+    private void removeEmitter(UUID jobId, SseEmitter emitter) {
+        List<SseEmitter> jobEmitters = emitters.get(jobId);
+        if (jobEmitters != null) {
+            jobEmitters.remove(emitter);
+            if (jobEmitters.isEmpty()) {
+                emitters.remove(jobId);
+            }
+        }
+    }
+}

backend/src/main/java/org/raddatz/familienarchiv/service/OcrService.java

@@ -0,0 +1,88 @@
+package org.raddatz.familienarchiv.service;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.raddatz.familienarchiv.dto.OcrStatusDTO;
+import org.raddatz.familienarchiv.exception.DomainException;
+import org.raddatz.familienarchiv.exception.ErrorCode;
+import org.raddatz.familienarchiv.model.*;
+import org.raddatz.familienarchiv.repository.OcrJobDocumentRepository;
+import org.raddatz.familienarchiv.repository.OcrJobRepository;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class OcrService {
+
+    private final OcrHealthClient ocrHealthClient;
+    private final DocumentService documentService;
+    private final OcrJobRepository ocrJobRepository;
+    private final OcrJobDocumentRepository ocrJobDocumentRepository;
+    private final OcrAsyncRunner ocrAsyncRunner;
+
+    public OcrJob getJob(UUID jobId) {
+        return ocrJobRepository.findById(jobId)
+                .orElseThrow(() -> DomainException.notFound(
+                        ErrorCode.OCR_JOB_NOT_FOUND, "OCR job not found: " + jobId));
+    }
+
+    public OcrStatusDTO getDocumentOcrStatus(UUID documentId) {
+        List<OcrDocumentStatus> activeStatuses = List.of(
+                OcrDocumentStatus.PENDING, OcrDocumentStatus.RUNNING);
+
+        Optional<OcrJobDocument> activeJobDoc = ocrJobDocumentRepository
+                .findFirstByDocumentIdAndStatusIn(documentId, activeStatuses);
+
+        if (activeJobDoc.isEmpty()) {
+            return OcrStatusDTO.builder().status("NONE").build();
+        }
+
+        OcrJobDocument jobDoc = activeJobDoc.get();
+        return OcrStatusDTO.builder()
+                .status(jobDoc.getStatus().name())
+                .jobId(jobDoc.getJobId())
+                .currentPage(jobDoc.getCurrentPage())
+                .totalPages(jobDoc.getTotalPages())
+                .build();
+    }
+
+    public UUID startOcr(UUID documentId, ScriptType scriptTypeOverride, UUID userId) {
+        Document doc = documentService.getDocumentById(documentId);
+
+        if (doc.getStatus() == DocumentStatus.PLACEHOLDER) {
+            throw DomainException.badRequest(ErrorCode.OCR_DOCUMENT_NOT_UPLOADED,
+                    "Document has no file attached: " + documentId);
+        }
+
+        if (!ocrHealthClient.isHealthy()) {
+            throw DomainException.internal(ErrorCode.OCR_SERVICE_UNAVAILABLE,
+                    "OCR service is not available");
+        }
+
+        if (scriptTypeOverride != null) {
+            documentService.updateScriptType(documentId, scriptTypeOverride);
+        }
+
+        OcrJob job = OcrJob.builder()
+                .totalDocuments(1)
+                .createdBy(userId)
+                .status(OcrJobStatus.PENDING)
+                .build();
+        job = ocrJobRepository.save(job);
+
+        OcrJobDocument jobDoc = OcrJobDocument.builder()
+                .jobId(job.getId())
+                .documentId(documentId)
+                .status(OcrDocumentStatus.PENDING)
+                .build();
+        ocrJobDocumentRepository.save(jobDoc);
+
+        ocrAsyncRunner.runSingleDocument(job.getId(), documentId, userId);
+        return job.getId();
+    }
+}

backend/src/main/java/org/raddatz/familienarchiv/service/OcrStreamEvent.java

@@ -0,0 +1,14 @@
+package org.raddatz.familienarchiv.service;
+
+import java.util.List;
+
+public sealed interface OcrStreamEvent {
+
+    record Start(int totalPages) implements OcrStreamEvent {}
+
+    record Page(int pageNumber, List<OcrBlockResult> blocks) implements OcrStreamEvent {}
+
+    record Error(int pageNumber, String message) implements OcrStreamEvent {}
+
+    record Done(int totalBlocks, int skippedPages) implements OcrStreamEvent {}
+}

backend/src/main/java/org/raddatz/familienarchiv/service/RestClientOcrClient.java

@@ -0,0 +1,187 @@
+package org.raddatz.familienarchiv.service;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.extern.slf4j.Slf4j;
+import org.raddatz.familienarchiv.model.ScriptType;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.http.MediaType;
+import org.springframework.http.client.JdkClientHttpRequestFactory;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestClient;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Consumer;
+
+@Component
+@Slf4j
+public class RestClientOcrClient implements OcrClient, OcrHealthClient {
+
+    private static final ObjectMapper NDJSON_MAPPER = new ObjectMapper()
+            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, true);
+
+    private final RestClient restClient;
+    private final HttpClient streamingHttpClient;
+    private final String baseUrl;
+
+    public RestClientOcrClient(@Value("${app.ocr.base-url:http://ocr-service:8000}") String baseUrl) {
+        this.baseUrl = baseUrl;
+
+        HttpClient httpClient = HttpClient.newBuilder()
+                .version(HttpClient.Version.HTTP_1_1)
+                .connectTimeout(Duration.ofSeconds(10))
+                .build();
+        JdkClientHttpRequestFactory requestFactory = new JdkClientHttpRequestFactory(httpClient);
+        requestFactory.setReadTimeout(Duration.ofMinutes(10));
+
+        this.restClient = RestClient.builder()
+                .baseUrl(baseUrl)
+                .requestFactory(requestFactory)
+                .build();
+
+        this.streamingHttpClient = HttpClient.newBuilder()
+                .version(HttpClient.Version.HTTP_1_1)
+                .connectTimeout(Duration.ofSeconds(10))
+                .build();
+    }
+
+    @Override
+    public List<OcrBlockResult> extractBlocks(String pdfUrl, ScriptType scriptType) {
+        Map<String, String> body = Map.of(
+                "pdfUrl", pdfUrl,
+                "scriptType", scriptType.name(),
+                "language", "de");
+
+        List<OcrBlockJson> response = restClient.post()
+                .uri("/ocr")
+                .contentType(MediaType.APPLICATION_JSON)
+                .body(body)
+                .retrieve()
+                .body(new ParameterizedTypeReference<>() {});
+
+        if (response == null) return List.of();
+
+        return response.stream()
+                .map(OcrBlockJson::toResult)
+                .toList();
+    }
+
+    @Override
+    public boolean isHealthy() {
+        try {
+            restClient.get()
+                    .uri("/health")
+                    .retrieve()
+                    .toBodilessEntity();
+            return true;
+        } catch (Exception e) {
+            log.warn("OCR service health check failed: {}", e.getMessage());
+            return false;
+        }
+    }
+
+    @Override
+    public void streamBlocks(String pdfUrl, ScriptType scriptType, Consumer<OcrStreamEvent> handler) {
+        String body;
+        try {
+            body = NDJSON_MAPPER.writeValueAsString(Map.of(
+                    "pdfUrl", pdfUrl,
+                    "scriptType", scriptType.name(),
+                    "language", "de"));
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to serialize OCR request", e);
+        }
+
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create(baseUrl + "/ocr/stream"))
+                .header("Content-Type", "application/json")
+                .POST(HttpRequest.BodyPublishers.ofString(body))
+                .timeout(Duration.ofMinutes(5))
+                .build();
+
+        try {
+            HttpResponse<InputStream> response = streamingHttpClient.send(
+                    request, HttpResponse.BodyHandlers.ofInputStream());
+
+            if (response.statusCode() == 404) {
+                log.info("OCR service does not support /ocr/stream (404), falling back to /ocr");
+                OcrClient.super.streamBlocks(pdfUrl, scriptType, handler);
+                return;
+            }
+
+            try (InputStream inputStream = response.body()) {
+                parseNdjsonStream(inputStream, handler);
+            }
+        } catch (IOException | InterruptedException e) {
+            if (e instanceof InterruptedException) {
+                Thread.currentThread().interrupt();
+            }
+            throw new RuntimeException("NDJSON stream failed: " + e.getMessage(), e);
+        }
+    }
+
+    static void parseNdjsonStream(InputStream inputStream, Consumer<OcrStreamEvent> handler) {
+        try (BufferedReader reader = new BufferedReader(
+                new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                if (line.isBlank()) continue;
+
+                JsonNode node = NDJSON_MAPPER.readTree(line);
+                String type = node.path("type").asText();
+
+                switch (type) {
+                    case "start" -> handler.accept(
+                            new OcrStreamEvent.Start(node.path("totalPages").asInt()));
+                    case "page" -> {
+                        int pageNumber = node.path("pageNumber").asInt();
+                        List<OcrBlockResult> blocks = NDJSON_MAPPER.convertValue(
+                                node.path("blocks"),
+                                new TypeReference<>() {});
+                        handler.accept(new OcrStreamEvent.Page(pageNumber, blocks));
+                    }
+                    case "error" -> handler.accept(
+                            new OcrStreamEvent.Error(
+                                    node.path("pageNumber").asInt(),
+                                    node.path("message").asText()));
+                    case "done" -> handler.accept(
+                            new OcrStreamEvent.Done(
+                                    node.path("totalBlocks").asInt(),
+                                    node.path("skippedPages").asInt()));
+                    default -> log.debug("Ignoring unknown NDJSON event type: {}", type);
+                }
+            }
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to parse NDJSON stream: " + e.getMessage(), e);
+        }
+    }
+
+    record OcrBlockJson(
+            @JsonProperty("pageNumber") int pageNumber,
+            double x,
+            double y,
+            double width,
+            double height,
+            List<List<Double>> polygon,
+            String text
+    ) {
+        OcrBlockResult toResult() {
+            return new OcrBlockResult(pageNumber, x, y, width, height, polygon, text);
+        }
+    }
+}

backend/src/main/java/org/raddatz/familienarchiv/service/TranscriptionService.java

@@ -8,6 +8,7 @@ import org.raddatz.familienarchiv.dto.ReorderTranscriptionBlocksDTO;
 import org.raddatz.familienarchiv.dto.UpdateTranscriptionBlockDTO;
 import org.raddatz.familienarchiv.exception.DomainException;
 import org.raddatz.familienarchiv.exception.ErrorCode;
+import org.raddatz.familienarchiv.model.BlockSource;
 import org.raddatz.familienarchiv.model.Document;
 import org.raddatz.familienarchiv.model.DocumentAnnotation;
 import org.raddatz.familienarchiv.model.TranscriptionBlock;
@@ -75,6 +76,24 @@ public class TranscriptionService {
         return saved;
     }
 
+    @Transactional
+    public TranscriptionBlock createOcrBlock(UUID documentId, UUID annotationId,
+                                              String text, int sortOrder, UUID userId) {
+        String sanitized = sanitizeText(text);
+        TranscriptionBlock block = TranscriptionBlock.builder()
+                .annotationId(annotationId)
+                .documentId(documentId)
+                .text(sanitized)
+                .sortOrder(sortOrder)
+                .source(BlockSource.OCR)
+                .createdBy(userId)
+                .updatedBy(userId)
+                .build();
+        TranscriptionBlock saved = blockRepository.save(block);
+        saveVersion(saved, userId);
+        return saved;
+    }
+
     @Transactional
     public TranscriptionBlock updateBlock(UUID documentId, UUID blockId,
                                           UpdateTranscriptionBlockDTO dto, UUID userId) {
@@ -106,6 +125,21 @@ public class TranscriptionService {
                 blockId, annotationId, documentId);
     }
 
+    @Transactional
+    public void deleteAllBlocksByDocument(UUID documentId) {
+        List<TranscriptionBlock> blocks = blockRepository.findByDocumentIdOrderBySortOrderAsc(documentId);
+        if (blocks.isEmpty()) return;
+
+        List<UUID> annotationIds = blocks.stream()
+                .map(TranscriptionBlock::getAnnotationId)
+                .toList();
+
+        blockRepository.deleteAll(blocks);
+        blockRepository.flush();
+        annotationRepository.deleteAllById(annotationIds);
+        log.info("Bulk-deleted {} transcription blocks for document {}", blocks.size(), documentId);
+    }
+
     @Transactional
     public void reorderBlocks(UUID documentId, ReorderTranscriptionBlocksDTO dto) {
         List<UUID> blockIds = dto.getBlockIds();
@@ -116,6 +150,13 @@ public class TranscriptionService {
         }
     }
 
+    @Transactional
+    public TranscriptionBlock reviewBlock(UUID documentId, UUID blockId) {
+        TranscriptionBlock block = getBlock(documentId, blockId);
+        block.setReviewed(!block.isReviewed());
+        return blockRepository.save(block);
+    }
+
     public List<TranscriptionBlockVersion> getBlockHistory(UUID documentId, UUID blockId) {
         getBlock(documentId, blockId);
         return versionRepository.findByBlockIdOrderByChangedAtDesc(blockId);

backend/src/main/resources/db/migration/V23__add_polygon_to_annotations.sql

@@ -0,0 +1,8 @@
+-- Add optional polygon field for quadrilateral annotation shapes (Kraken OCR output).
+-- See ADR-002 for the design decision.
+
+ALTER TABLE document_annotations ADD COLUMN polygon JSONB;
+
+ALTER TABLE document_annotations
+ADD CONSTRAINT chk_annotation_polygon_quad
+    CHECK (polygon IS NULL OR jsonb_array_length(polygon) = 4);

backend/src/main/resources/db/migration/V24__add_script_type_to_documents.sql

@@ -0,0 +1 @@
+ALTER TABLE documents ADD COLUMN script_type VARCHAR(30) NOT NULL DEFAULT 'UNKNOWN';

backend/src/main/resources/db/migration/V25__add_ocr_job_tables.sql

@@ -0,0 +1,26 @@
+CREATE TABLE ocr_jobs (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    status VARCHAR(20) NOT NULL DEFAULT 'PENDING',
+    total_documents INT NOT NULL,
+    processed_documents INT NOT NULL DEFAULT 0,
+    error_count INT NOT NULL DEFAULT 0,
+    skipped_count INT NOT NULL DEFAULT 0,
+    created_by UUID,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE ocr_job_documents (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    job_id UUID NOT NULL REFERENCES ocr_jobs(id) ON DELETE CASCADE,
+    document_id UUID NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
+    status VARCHAR(20) NOT NULL DEFAULT 'PENDING',
+    error_message TEXT,
+    current_page INT DEFAULT 0,
+    total_pages INT DEFAULT 0,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX idx_ocr_job_documents_job_id ON ocr_job_documents(job_id);
+CREATE INDEX idx_ocr_job_documents_document_id ON ocr_job_documents(document_id);

backend/src/main/resources/db/migration/V26__add_source_and_reviewed_to_transcription_blocks.sql

@@ -0,0 +1,2 @@
+ALTER TABLE transcription_blocks ADD COLUMN source VARCHAR(10) NOT NULL DEFAULT 'MANUAL';
+ALTER TABLE transcription_blocks ADD COLUMN reviewed BOOLEAN NOT NULL DEFAULT FALSE;

backend/src/main/resources/db/migration/V27__add_progress_message_to_ocr_jobs.sql

@@ -0,0 +1 @@
+ALTER TABLE ocr_jobs ADD COLUMN progress_message TEXT;

backend/src/main/resources/db/migration/V28__add_unique_constraint_ocr_job_documents.sql

@@ -0,0 +1,2 @@
+ALTER TABLE ocr_job_documents
+    ADD CONSTRAINT uq_ocr_job_document UNIQUE (job_id, document_id);

backend/src/test/java/org/raddatz/familienarchiv/controller/OcrControllerTest.java

@@ -0,0 +1,135 @@
+package org.raddatz.familienarchiv.controller;
+
+import tools.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+import org.raddatz.familienarchiv.config.SecurityConfig;
+import org.raddatz.familienarchiv.dto.BatchOcrDTO;
+import org.raddatz.familienarchiv.dto.OcrStatusDTO;
+import org.raddatz.familienarchiv.dto.TriggerOcrDTO;
+import org.raddatz.familienarchiv.exception.DomainException;
+import org.raddatz.familienarchiv.exception.ErrorCode;
+import org.raddatz.familienarchiv.model.*;
+import org.raddatz.familienarchiv.security.PermissionAspect;
+import org.raddatz.familienarchiv.service.*;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.aop.AopAutoConfiguration;
+import org.springframework.boot.webmvc.test.autoconfigure.WebMvcTest;
+import org.springframework.context.annotation.Import;
+import org.springframework.http.MediaType;
+import org.springframework.security.test.context.support.WithMockUser;
+import org.springframework.test.context.bean.override.mockito.MockitoBean;
+import org.springframework.test.web.servlet.MockMvc;
+
+import java.util.List;
+import java.util.UUID;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@WebMvcTest(OcrController.class)
+@Import({SecurityConfig.class, PermissionAspect.class, AopAutoConfiguration.class})
+class OcrControllerTest {
+
+    @Autowired MockMvc mockMvc;
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
+    @MockitoBean OcrService ocrService;
+    @MockitoBean OcrBatchService ocrBatchService;
+    @MockitoBean OcrProgressService ocrProgressService;
+    @MockitoBean UserService userService;
+    @MockitoBean CustomUserDetailsService customUserDetailsService;
+
+    @Test
+    @WithMockUser(authorities = "WRITE_ALL")
+    void triggerOcr_returns202_withJobId() throws Exception {
+        UUID docId = UUID.randomUUID();
+        UUID jobId = UUID.randomUUID();
+        TriggerOcrDTO dto = new TriggerOcrDTO(ScriptType.TYPEWRITER);
+
+        when(ocrService.startOcr(eq(docId), eq(ScriptType.TYPEWRITER), any())).thenReturn(jobId);
+
+        mockMvc.perform(post("/api/documents/{id}/ocr", docId)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(dto)))
+                .andExpect(status().isAccepted())
+                .andExpect(jsonPath("$.jobId").value(jobId.toString()));
+    }
+
+    @Test
+    @WithMockUser(authorities = "WRITE_ALL")
+    void triggerOcr_returns400_whenDocumentNotUploaded() throws Exception {
+        UUID docId = UUID.randomUUID();
+        when(ocrService.startOcr(eq(docId), any(), any()))
+                .thenThrow(DomainException.badRequest(ErrorCode.OCR_DOCUMENT_NOT_UPLOADED, "Not uploaded"));
+
+        mockMvc.perform(post("/api/documents/{id}/ocr", docId)
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("{}"))
+                .andExpect(status().isBadRequest());
+    }
+
+    @Test
+    @WithMockUser(authorities = "READ_ALL")
+    void getJobStatus_returns404_whenJobNotFound() throws Exception {
+        UUID jobId = UUID.randomUUID();
+        when(ocrService.getJob(jobId))
+                .thenThrow(DomainException.notFound(ErrorCode.OCR_JOB_NOT_FOUND, "OCR job not found"));
+
+        mockMvc.perform(get("/api/ocr/jobs/{jobId}", jobId))
+                .andExpect(status().isNotFound());
+    }
+
+    @Test
+    @WithMockUser(authorities = "READ_ALL")
+    void getJobStatus_returnsJobInfo_whenFound() throws Exception {
+        UUID jobId = UUID.randomUUID();
+        OcrJob job = OcrJob.builder()
+                .id(jobId)
+                .status(OcrJobStatus.RUNNING)
+                .totalDocuments(10)
+                .processedDocuments(3)
+                .errorCount(1)
+                .skippedCount(0)
+                .build();
+        when(ocrService.getJob(jobId)).thenReturn(job);
+
+        mockMvc.perform(get("/api/ocr/jobs/{jobId}", jobId))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.status").value("RUNNING"))
+                .andExpect(jsonPath("$.totalDocuments").value(10))
+                .andExpect(jsonPath("$.processedDocuments").value(3));
+    }
+
+    @Test
+    @WithMockUser(authorities = "ADMIN")
+    void triggerBatch_returns202_withJobId() throws Exception {
+        UUID jobId = UUID.randomUUID();
+        List<UUID> docIds = List.of(UUID.randomUUID(), UUID.randomUUID());
+        BatchOcrDTO dto = new BatchOcrDTO(docIds);
+
+        when(ocrBatchService.startBatch(eq(docIds), any())).thenReturn(jobId);
+
+        mockMvc.perform(post("/api/ocr/batch")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(dto)))
+                .andExpect(status().isAccepted())
+                .andExpect(jsonPath("$.jobId").value(jobId.toString()));
+    }
+
+    @Test
+    @WithMockUser(authorities = "READ_ALL")
+    void getDocumentOcrStatus_returnsNone_whenNoOcrJobExists() throws Exception {
+        UUID docId = UUID.randomUUID();
+        when(ocrService.getDocumentOcrStatus(docId))
+                .thenReturn(OcrStatusDTO.builder().status("NONE").build());
+
+        mockMvc.perform(get("/api/documents/{id}/ocr-status", docId))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.status").value("NONE"));
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/controller/TranscriptionBlockControllerTest.java

@@ -356,4 +356,20 @@ class TranscriptionBlockControllerTest {
                 .andExpect(status().isOk())
                 .andExpect(jsonPath("$").isEmpty());
     }
+
+    // ─── PUT .../review ──────────────────────────────────────────────────────
+
+    @Test
+    @WithMockUser(authorities = "WRITE_ALL")
+    void reviewBlock_returns200_withToggledBlock() throws Exception {
+        TranscriptionBlock reviewed = TranscriptionBlock.builder()
+                .id(BLOCK_ID).documentId(DOC_ID).annotationId(UUID.randomUUID())
+                .text("text").sortOrder(0).reviewed(true).build();
+        when(transcriptionService.reviewBlock(DOC_ID, BLOCK_ID)).thenReturn(reviewed);
+
+        mockMvc.perform(put("/api/documents/{documentId}/transcription-blocks/{blockId}/review",
+                        DOC_ID, BLOCK_ID))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.reviewed").value(true));
+    }
 }

backend/src/test/java/org/raddatz/familienarchiv/dto/UniquePointsValidatorTest.java

@@ -0,0 +1,124 @@
+package org.raddatz.familienarchiv.dto;
+
+import jakarta.validation.ConstraintViolation;
+import jakarta.validation.Validation;
+import jakarta.validation.Validator;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Set;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class UniquePointsValidatorTest {
+
+    private final Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
+
+    @Test
+    void shouldAcceptNull() {
+        var dto = new CreateAnnotationDTO();
+        dto.setPolygon(null);
+
+        Set<ConstraintViolation<CreateAnnotationDTO>> violations = validator.validate(dto);
+
+        assertThat(violations).noneMatch(v -> v.getPropertyPath().toString().equals("polygon"));
+    }
+
+    @Test
+    void shouldAcceptFourUniquePoints() {
+        var dto = new CreateAnnotationDTO();
+        dto.setPolygon(List.of(
+                List.of(0.1, 0.1),
+                List.of(0.9, 0.1),
+                List.of(0.9, 0.9),
+                List.of(0.1, 0.9)));
+
+        Set<ConstraintViolation<CreateAnnotationDTO>> violations = validator.validate(dto);
+
+        assertThat(violations).noneMatch(v -> v.getPropertyPath().toString().equals("polygon"));
+    }
+
+    @Test
+    void shouldRejectDuplicatePoints() {
+        var dto = new CreateAnnotationDTO();
+        dto.setPolygon(List.of(
+                List.of(0.1, 0.1),
+                List.of(0.1, 0.1),
+                List.of(0.9, 0.9),
+                List.of(0.1, 0.9)));
+
+        Set<ConstraintViolation<CreateAnnotationDTO>> violations = validator.validate(dto);
+
+        assertThat(violations).anyMatch(v -> v.getPropertyPath().toString().equals("polygon"));
+    }
+
+    @Test
+    void shouldRejectPolygonWithThreePoints() {
+        var dto = new CreateAnnotationDTO();
+        dto.setPolygon(List.of(
+                List.of(0.1, 0.1),
+                List.of(0.9, 0.1),
+                List.of(0.9, 0.9)));
+
+        Set<ConstraintViolation<CreateAnnotationDTO>> violations = validator.validate(dto);
+
+        assertThat(violations).anyMatch(v -> v.getPropertyPath().toString().equals("polygon"));
+    }
+
+    @Test
+    void shouldRejectPolygonWithFivePoints() {
+        var dto = new CreateAnnotationDTO();
+        dto.setPolygon(List.of(
+                List.of(0.1, 0.1),
+                List.of(0.5, 0.1),
+                List.of(0.9, 0.1),
+                List.of(0.9, 0.9),
+                List.of(0.1, 0.9)));
+
+        Set<ConstraintViolation<CreateAnnotationDTO>> violations = validator.validate(dto);
+
+        assertThat(violations).anyMatch(v -> v.getPropertyPath().toString().equals("polygon"));
+    }
+
+    @Test
+    void shouldRejectCoordinateOutOfRange() {
+        var dto = new CreateAnnotationDTO();
+        dto.setPolygon(List.of(
+                List.of(1.5, 0.1),
+                List.of(0.9, 0.1),
+                List.of(0.9, 0.9),
+                List.of(0.1, 0.9)));
+
+        Set<ConstraintViolation<CreateAnnotationDTO>> violations = validator.validate(dto);
+
+        assertThat(violations).anyMatch(v -> v.getPropertyPath().toString().contains("polygon"));
+    }
+
+    @Test
+    void shouldRejectNegativeCoordinate() {
+        var dto = new CreateAnnotationDTO();
+        dto.setPolygon(List.of(
+                List.of(-0.1, 0.1),
+                List.of(0.9, 0.1),
+                List.of(0.9, 0.9),
+                List.of(0.1, 0.9)));
+
+        Set<ConstraintViolation<CreateAnnotationDTO>> violations = validator.validate(dto);
+
+        assertThat(violations).anyMatch(v -> v.getPropertyPath().toString().contains("polygon"));
+    }
+
+    @Test
+    void shouldRejectPointWithOneCoordinate() {
+        var dto = new CreateAnnotationDTO();
+        dto.setPolygon(List.of(
+                List.of(0.1),
+                List.of(0.9, 0.1),
+                List.of(0.9, 0.9),
+                List.of(0.1, 0.9)));
+
+        Set<ConstraintViolation<CreateAnnotationDTO>> violations = validator.validate(dto);
+
+        assertThat(violations).anyMatch(v -> v.getPropertyPath().toString().contains("polygon"));
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/model/PolygonConverterTest.java

@@ -0,0 +1,65 @@
+package org.raddatz.familienarchiv.model;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class PolygonConverterTest {
+
+    private final PolygonConverter converter = new PolygonConverter();
+
+    @Test
+    void convertToDatabaseColumn_returnsNull_whenPolygonIsNull() {
+        assertThat(converter.convertToDatabaseColumn(null)).isNull();
+    }
+
+    @Test
+    void convertToDatabaseColumn_returnsJsonArray_whenPolygonIsValid() {
+        List<List<Double>> polygon = List.of(
+                List.of(0.1, 0.2),
+                List.of(0.9, 0.2),
+                List.of(0.9, 0.8),
+                List.of(0.1, 0.8));
+
+        String json = converter.convertToDatabaseColumn(polygon);
+
+        assertThat(json).isEqualTo("[[0.1,0.2],[0.9,0.2],[0.9,0.8],[0.1,0.8]]");
+    }
+
+    @Test
+    void convertToEntityAttribute_returnsNull_whenJsonIsNull() {
+        assertThat(converter.convertToEntityAttribute(null)).isNull();
+    }
+
+    @Test
+    void convertToEntityAttribute_returnsNull_whenJsonIsEmpty() {
+        assertThat(converter.convertToEntityAttribute("")).isNull();
+    }
+
+    @Test
+    void convertToEntityAttribute_returnsPolygon_whenJsonIsValid() {
+        String json = "[[0.1,0.2],[0.9,0.2],[0.9,0.8],[0.1,0.8]]";
+
+        List<List<Double>> polygon = converter.convertToEntityAttribute(json);
+
+        assertThat(polygon).hasSize(4);
+        assertThat(polygon.get(0)).containsExactly(0.1, 0.2);
+        assertThat(polygon.get(3)).containsExactly(0.1, 0.8);
+    }
+
+    @Test
+    void roundTrip_preservesValues() {
+        List<List<Double>> original = List.of(
+                List.of(0.12, 0.08),
+                List.of(0.88, 0.09),
+                List.of(0.87, 0.14),
+                List.of(0.11, 0.13));
+
+        String json = converter.convertToDatabaseColumn(original);
+        List<List<Double>> restored = converter.convertToEntityAttribute(json);
+
+        assertThat(restored).isEqualTo(original);
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/service/AnnotationServiceTest.java

@@ -260,6 +260,55 @@ class AnnotationServiceTest {
         verify(annotationRepository).save(any());
     }
 
+    // ─── createOcrAnnotation ──────────────────────────────────────────────────
+
+    @Test
+    void createOcrAnnotation_skipsOverlapCheck_andSavesWithPolygon() {
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        CreateAnnotationDTO dto = new CreateAnnotationDTO(1, 0.1, 0.1, 0.8, 0.04, "#00C7B1");
+        List<List<Double>> polygon = List.of(
+                List.of(0.1, 0.1), List.of(0.9, 0.11),
+                List.of(0.89, 0.14), List.of(0.11, 0.13));
+        when(annotationRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        DocumentAnnotation result = annotationService.createOcrAnnotation(
+                docId, dto, userId, "filehash", polygon);
+
+        assertThat(result.getPolygon()).isEqualTo(polygon);
+        assertThat(result.getDocumentId()).isEqualTo(docId);
+        verify(annotationRepository).save(any());
+        verify(annotationRepository, never()).findByDocumentIdAndPageNumber(any(), any(int.class));
+    }
+
+    @Test
+    void createOcrAnnotation_savesWithNullPolygon_whenPolygonNotProvided() {
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        CreateAnnotationDTO dto = new CreateAnnotationDTO(1, 0.1, 0.1, 0.8, 0.04, "#00C7B1");
+        when(annotationRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        DocumentAnnotation result = annotationService.createOcrAnnotation(
+                docId, dto, userId, "filehash", null);
+
+        assertThat(result.getPolygon()).isNull();
+        verify(annotationRepository).save(any());
+    }
+
+    @Test
+    void createOcrAnnotation_doesNotCheckOverlap_evenWhenOverlappingAnnotationExists() {
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        CreateAnnotationDTO dto = new CreateAnnotationDTO(1, 0.1, 0.1, 0.3, 0.3, "#00C7B1");
+        when(annotationRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        annotationService.createOcrAnnotation(docId, dto, userId, "hash", null);
+
+        verify(annotationRepository, never()).findByDocumentIdAndPageNumber(any(), any(int.class));
+    }
+
+    // ─── overlaps — partial overlap cases ────────────────────────────────────
+
     @Test
     void createAnnotation_noConflict_whenAnnotationIsAbove() {
         // x ranges overlap, y ranges don't — existing is ABOVE the new annotation

backend/src/test/java/org/raddatz/familienarchiv/service/FileServiceTest.java

@@ -32,7 +32,7 @@ class FileServiceTest {
     @BeforeEach
     void setUp() {
         s3Client = mock(S3Client.class);
-        fileService = new FileService(s3Client, "test-bucket");
+        fileService = new FileService(s3Client, null, "test-bucket");
     }
 
     @Test

backend/src/test/java/org/raddatz/familienarchiv/service/OcrAsyncRunnerTest.java

@@ -0,0 +1,269 @@
+package org.raddatz.familienarchiv.service;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.raddatz.familienarchiv.dto.CreateAnnotationDTO;
+import org.raddatz.familienarchiv.model.*;
+import org.raddatz.familienarchiv.repository.OcrJobDocumentRepository;
+import org.raddatz.familienarchiv.repository.OcrJobRepository;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.function.Consumer;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class OcrAsyncRunnerTest {
+
+    @Mock OcrClient ocrClient;
+    @Mock DocumentService documentService;
+    @Mock TranscriptionService transcriptionService;
+    @Mock AnnotationService annotationService;
+    @Mock FileService fileService;
+    @Mock OcrJobRepository ocrJobRepository;
+    @Mock OcrJobDocumentRepository ocrJobDocumentRepository;
+    @Mock OcrProgressService ocrProgressService;
+
+    @InjectMocks OcrAsyncRunner ocrAsyncRunner;
+
+    @Test
+    void processDocument_clearsExistingBlocks() {
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        Document doc = Document.builder().id(docId).filePath("test.pdf")
+                .fileHash("hash").scriptType(ScriptType.TYPEWRITER).build();
+
+        when(fileService.generatePresignedUrl(any())).thenReturn("http://presigned");
+        when(ocrClient.extractBlocks(any(), any())).thenReturn(List.of());
+
+        ocrAsyncRunner.processDocument(docId, doc, userId);
+
+        verify(transcriptionService).deleteAllBlocksByDocument(docId);
+    }
+
+    @Test
+    void processDocument_createsAnnotationAndBlock_forEachResult() {
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        UUID annId = UUID.randomUUID();
+        Document doc = Document.builder().id(docId).filePath("test.pdf")
+                .fileHash("hash").scriptType(ScriptType.TYPEWRITER).build();
+
+
+        when(fileService.generatePresignedUrl(any())).thenReturn("http://presigned");
+        when(ocrClient.extractBlocks(any(), any())).thenReturn(List.of(
+                new OcrBlockResult(0, 0.1, 0.1, 0.8, 0.04, null, "Line 1"),
+                new OcrBlockResult(0, 0.1, 0.2, 0.8, 0.04, null, "Line 2")));
+        DocumentAnnotation ann = DocumentAnnotation.builder().id(annId).build();
+        when(annotationService.createOcrAnnotation(any(), any(), any(), any(), any())).thenReturn(ann);
+
+        ocrAsyncRunner.processDocument(docId, doc, userId);
+
+        verify(annotationService, times(2)).createOcrAnnotation(
+                eq(docId), any(CreateAnnotationDTO.class), eq(userId), eq("hash"), any());
+        verify(transcriptionService, times(2)).createOcrBlock(
+                eq(docId), eq(annId), any(), anyInt(), eq(userId));
+    }
+
+    @Test
+    void processDocument_delegatesBlockCreationToTranscriptionService() {
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        UUID annId = UUID.randomUUID();
+        Document doc = Document.builder().id(docId).filePath("test.pdf")
+                .fileHash("hash").scriptType(ScriptType.TYPEWRITER).build();
+
+
+        when(fileService.generatePresignedUrl(any())).thenReturn("http://presigned");
+        when(ocrClient.extractBlocks(any(), any())).thenReturn(List.of(
+                new OcrBlockResult(0, 0.1, 0.1, 0.8, 0.04, null, "Test")));
+        DocumentAnnotation ann = DocumentAnnotation.builder().id(annId).build();
+        when(annotationService.createOcrAnnotation(any(), any(), any(), any(), any())).thenReturn(ann);
+
+        ocrAsyncRunner.processDocument(docId, doc, userId);
+
+        verify(transcriptionService).createOcrBlock(docId, annId, "Test", 0, userId);
+    }
+
+    @Test
+    void runSingleDocument_setsJobDone_onSuccess() {
+        UUID jobId = UUID.randomUUID();
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        OcrJob job = OcrJob.builder().id(jobId).totalDocuments(1).status(OcrJobStatus.PENDING).build();
+        OcrJobDocument jobDoc = OcrJobDocument.builder().id(UUID.randomUUID())
+                .jobId(jobId).documentId(docId).status(OcrDocumentStatus.PENDING).build();
+        Document doc = Document.builder().id(docId).filePath("test.pdf")
+                .fileHash("hash").scriptType(ScriptType.TYPEWRITER).build();
+
+        when(ocrJobRepository.findById(jobId)).thenReturn(Optional.of(job));
+        when(ocrJobRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+        when(ocrJobDocumentRepository.findByJobIdAndDocumentId(jobId, docId))
+                .thenReturn(Optional.of(jobDoc));
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+
+        when(fileService.generatePresignedUrl(any())).thenReturn("http://presigned");
+        doAnswer(inv -> {
+            Consumer<OcrStreamEvent> handler = inv.getArgument(2);
+            handler.accept(new OcrStreamEvent.Start(1));
+            handler.accept(new OcrStreamEvent.Page(0, List.of()));
+            handler.accept(new OcrStreamEvent.Done(0, 0));
+            return null;
+        }).when(ocrClient).streamBlocks(any(), any(), any());
+
+        ocrAsyncRunner.runSingleDocument(jobId, docId, userId);
+
+        assertThat(job.getStatus()).isEqualTo(OcrJobStatus.DONE);
+    }
+
+    @Test
+    void runSingleDocument_setsJobFailed_onError() {
+        UUID jobId = UUID.randomUUID();
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        OcrJob job = OcrJob.builder().id(jobId).totalDocuments(1).status(OcrJobStatus.PENDING).build();
+        OcrJobDocument jobDoc = OcrJobDocument.builder().id(UUID.randomUUID())
+                .jobId(jobId).documentId(docId).status(OcrDocumentStatus.PENDING).build();
+        Document doc = Document.builder().id(docId).filePath("test.pdf")
+                .fileHash("hash").scriptType(ScriptType.TYPEWRITER).build();
+
+        when(ocrJobRepository.findById(jobId)).thenReturn(Optional.of(job));
+        when(ocrJobRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+        when(ocrJobDocumentRepository.findByJobIdAndDocumentId(jobId, docId))
+                .thenReturn(Optional.of(jobDoc));
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+
+        when(fileService.generatePresignedUrl(any())).thenReturn("http://presigned");
+        doThrow(new RuntimeException("OCR failed")).when(ocrClient).streamBlocks(any(), any(), any());
+
+        ocrAsyncRunner.runSingleDocument(jobId, docId, userId);
+
+        assertThat(job.getStatus()).isEqualTo(OcrJobStatus.FAILED);
+        assertThat(job.getErrorCount()).isEqualTo(1);
+    }
+
+    @Test
+    void runSingleDocument_updatesProgressPerPage() {
+        UUID jobId = UUID.randomUUID();
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        OcrJob job = OcrJob.builder().id(jobId).totalDocuments(1).status(OcrJobStatus.PENDING).build();
+        OcrJobDocument jobDoc = OcrJobDocument.builder().id(UUID.randomUUID())
+                .jobId(jobId).documentId(docId).status(OcrDocumentStatus.PENDING).build();
+        Document doc = Document.builder().id(docId).filePath("test.pdf")
+                .fileHash("hash").scriptType(ScriptType.TYPEWRITER).build();
+        DocumentAnnotation ann = DocumentAnnotation.builder().id(UUID.randomUUID()).build();
+
+        when(ocrJobRepository.findById(jobId)).thenReturn(Optional.of(job));
+        when(ocrJobRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+        when(ocrJobDocumentRepository.findByJobIdAndDocumentId(jobId, docId))
+                .thenReturn(Optional.of(jobDoc));
+        when(ocrJobDocumentRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+
+        when(fileService.generatePresignedUrl(any())).thenReturn("http://presigned");
+        when(annotationService.createOcrAnnotation(any(), any(), any(), any(), any())).thenReturn(ann);
+
+        List<String> progressMessages = new ArrayList<>();
+        doAnswer(inv -> {
+            Consumer<OcrStreamEvent> handler = inv.getArgument(2);
+            handler.accept(new OcrStreamEvent.Start(3));
+            handler.accept(new OcrStreamEvent.Page(0, List.of(
+                    new OcrBlockResult(0, 0.1, 0.1, 0.8, 0.04, null, "L1"),
+                    new OcrBlockResult(0, 0.1, 0.2, 0.8, 0.04, null, "L2"))));
+            progressMessages.add(job.getProgressMessage());
+            handler.accept(new OcrStreamEvent.Page(1, List.of(
+                    new OcrBlockResult(1, 0.1, 0.1, 0.8, 0.04, null, "L3"))));
+            progressMessages.add(job.getProgressMessage());
+            handler.accept(new OcrStreamEvent.Done(3, 0));
+            return null;
+        }).when(ocrClient).streamBlocks(any(), any(), any());
+
+        ocrAsyncRunner.runSingleDocument(jobId, docId, userId);
+
+        assertThat(progressMessages.get(0)).isEqualTo("ANALYZING_PAGE:1:3:2");
+        assertThat(progressMessages.get(1)).isEqualTo("ANALYZING_PAGE:2:3:3");
+        assertThat(job.getProgressMessage()).isEqualTo("DONE:3:0");
+    }
+
+    @Test
+    void runSingleDocument_includesSkippedPagesInDoneMessage() {
+        UUID jobId = UUID.randomUUID();
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        OcrJob job = OcrJob.builder().id(jobId).totalDocuments(1).status(OcrJobStatus.PENDING).build();
+        OcrJobDocument jobDoc = OcrJobDocument.builder().id(UUID.randomUUID())
+                .jobId(jobId).documentId(docId).status(OcrDocumentStatus.PENDING).build();
+        Document doc = Document.builder().id(docId).filePath("test.pdf")
+                .fileHash("hash").scriptType(ScriptType.TYPEWRITER).build();
+
+        when(ocrJobRepository.findById(jobId)).thenReturn(Optional.of(job));
+        when(ocrJobRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+        when(ocrJobDocumentRepository.findByJobIdAndDocumentId(jobId, docId))
+                .thenReturn(Optional.of(jobDoc));
+        when(ocrJobDocumentRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+
+        when(fileService.generatePresignedUrl(any())).thenReturn("http://presigned");
+
+        doAnswer(inv -> {
+            Consumer<OcrStreamEvent> handler = inv.getArgument(2);
+            handler.accept(new OcrStreamEvent.Start(3));
+            handler.accept(new OcrStreamEvent.Page(0, List.of()));
+            handler.accept(new OcrStreamEvent.Error(1, "failed"));
+            handler.accept(new OcrStreamEvent.Page(2, List.of()));
+            handler.accept(new OcrStreamEvent.Done(0, 1));
+            return null;
+        }).when(ocrClient).streamBlocks(any(), any(), any());
+
+        ocrAsyncRunner.runSingleDocument(jobId, docId, userId);
+
+        assertThat(job.getStatus()).isEqualTo(OcrJobStatus.DONE);
+        assertThat(job.getProgressMessage()).isEqualTo("DONE:0:1");
+    }
+
+    @Test
+    void runSingleDocument_logsStreamErrorAtWarnWithoutSettingJobFailed() {
+        UUID jobId = UUID.randomUUID();
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        OcrJob job = OcrJob.builder().id(jobId).totalDocuments(1).status(OcrJobStatus.PENDING).build();
+        OcrJobDocument jobDoc = OcrJobDocument.builder().id(UUID.randomUUID())
+                .jobId(jobId).documentId(docId).status(OcrDocumentStatus.PENDING).build();
+        Document doc = Document.builder().id(docId).filePath("test.pdf")
+                .fileHash("hash").scriptType(ScriptType.TYPEWRITER).build();
+
+        when(ocrJobRepository.findById(jobId)).thenReturn(Optional.of(job));
+        when(ocrJobRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+        when(ocrJobDocumentRepository.findByJobIdAndDocumentId(jobId, docId))
+                .thenReturn(Optional.of(jobDoc));
+        when(ocrJobDocumentRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+
+        when(fileService.generatePresignedUrl(any())).thenReturn("http://presigned");
+
+        doAnswer(inv -> {
+            Consumer<OcrStreamEvent> handler = inv.getArgument(2);
+            handler.accept(new OcrStreamEvent.Start(2));
+            handler.accept(new OcrStreamEvent.Error(0, "some python traceback details"));
+            handler.accept(new OcrStreamEvent.Page(1, List.of()));
+            handler.accept(new OcrStreamEvent.Done(0, 1));
+            return null;
+        }).when(ocrClient).streamBlocks(any(), any(), any());
+
+        ocrAsyncRunner.runSingleDocument(jobId, docId, userId);
+
+        // Job should still be DONE, not FAILED (per-page errors don't fail the whole job)
+        assertThat(job.getStatus()).isEqualTo(OcrJobStatus.DONE);
+        // Raw error message should not leak to progress
+        assertThat(job.getProgressMessage()).doesNotContain("python traceback");
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/service/OcrBatchServiceTest.java

@@ -0,0 +1,80 @@
+package org.raddatz.familienarchiv.service;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.raddatz.familienarchiv.exception.DomainException;
+import org.raddatz.familienarchiv.exception.ErrorCode;
+import org.raddatz.familienarchiv.model.*;
+import org.raddatz.familienarchiv.repository.OcrJobDocumentRepository;
+import org.raddatz.familienarchiv.repository.OcrJobRepository;
+
+import java.util.List;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class OcrBatchServiceTest {
+
+    @Mock OcrHealthClient ocrHealthClient;
+    @Mock OcrJobRepository ocrJobRepository;
+    @Mock OcrJobDocumentRepository ocrJobDocumentRepository;
+    @Mock OcrAsyncRunner ocrAsyncRunner;
+
+    @InjectMocks OcrBatchService ocrBatchService;
+
+    @Test
+    void startBatch_throwsServiceUnavailable_whenOcrServiceIsDown() {
+        when(ocrHealthClient.isHealthy()).thenReturn(false);
+
+        assertThatThrownBy(() -> ocrBatchService.startBatch(List.of(UUID.randomUUID()), UUID.randomUUID()))
+                .isInstanceOf(DomainException.class)
+                .satisfies(e -> assertThat(((DomainException) e).getCode())
+                        .isEqualTo(ErrorCode.OCR_SERVICE_UNAVAILABLE));
+    }
+
+    @Test
+    void startBatch_createsJobAndDispatchesAsync() {
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        UUID jobId = UUID.randomUUID();
+
+        when(ocrHealthClient.isHealthy()).thenReturn(true);
+        when(ocrJobRepository.save(any())).thenAnswer(inv -> {
+            OcrJob job = inv.getArgument(0);
+            job.setId(jobId);
+            return job;
+        });
+        when(ocrJobDocumentRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        UUID result = ocrBatchService.startBatch(List.of(docId), userId);
+
+        assertThat(result).isEqualTo(jobId);
+        verify(ocrAsyncRunner).runBatch(jobId, userId);
+    }
+
+    @Test
+    void startBatch_createsJobDocumentForEachId() {
+        UUID doc1 = UUID.randomUUID();
+        UUID doc2 = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+
+        when(ocrHealthClient.isHealthy()).thenReturn(true);
+        when(ocrJobRepository.save(any())).thenAnswer(inv -> {
+            OcrJob job = inv.getArgument(0);
+            job.setId(UUID.randomUUID());
+            return job;
+        });
+        when(ocrJobDocumentRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        ocrBatchService.startBatch(List.of(doc1, doc2), userId);
+
+        verify(ocrJobDocumentRepository, times(2)).save(any());
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/service/OcrClientDefaultStreamTest.java

@@ -0,0 +1,55 @@
+package org.raddatz.familienarchiv.service;
+
+import org.junit.jupiter.api.Test;
+import org.raddatz.familienarchiv.model.ScriptType;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class OcrClientDefaultStreamTest {
+
+    @Test
+    void defaultStreamBlocksSynthesizesEventsFromExtractBlocks() {
+        OcrClient client = (pdfUrl, scriptType) -> List.of(
+                new OcrBlockResult(0, 0.1, 0.1, 0.8, 0.04, null, "Line 1"),
+                new OcrBlockResult(0, 0.1, 0.2, 0.8, 0.04, null, "Line 2"),
+                new OcrBlockResult(1, 0.1, 0.1, 0.8, 0.04, null, "Line 3"));
+
+        List<OcrStreamEvent> events = new ArrayList<>();
+        client.streamBlocks("http://test", ScriptType.TYPEWRITER, events::add);
+
+        assertThat(events).hasSize(4);
+        assertThat(events.get(0)).isInstanceOf(OcrStreamEvent.Start.class);
+        assertThat(((OcrStreamEvent.Start) events.get(0)).totalPages()).isEqualTo(2);
+
+        assertThat(events.get(1)).isInstanceOf(OcrStreamEvent.Page.class);
+        var page0 = (OcrStreamEvent.Page) events.get(1);
+        assertThat(page0.pageNumber()).isEqualTo(0);
+        assertThat(page0.blocks()).hasSize(2);
+
+        assertThat(events.get(2)).isInstanceOf(OcrStreamEvent.Page.class);
+        var page1 = (OcrStreamEvent.Page) events.get(2);
+        assertThat(page1.pageNumber()).isEqualTo(1);
+        assertThat(page1.blocks()).hasSize(1);
+
+        assertThat(events.get(3)).isInstanceOf(OcrStreamEvent.Done.class);
+        var done = (OcrStreamEvent.Done) events.get(3);
+        assertThat(done.totalBlocks()).isEqualTo(3);
+        assertThat(done.skippedPages()).isEqualTo(0);
+    }
+
+    @Test
+    void defaultStreamBlocksHandlesEmptyResults() {
+        OcrClient client = (pdfUrl, scriptType) -> List.of();
+
+        List<OcrStreamEvent> events = new ArrayList<>();
+        client.streamBlocks("http://test", ScriptType.TYPEWRITER, events::add);
+
+        assertThat(events).hasSize(2);
+        assertThat(events.get(0)).isInstanceOf(OcrStreamEvent.Start.class);
+        assertThat(((OcrStreamEvent.Start) events.get(0)).totalPages()).isEqualTo(0);
+        assertThat(events.get(1)).isInstanceOf(OcrStreamEvent.Done.class);
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/service/OcrProgressServiceTest.java

@@ -0,0 +1,33 @@
+package org.raddatz.familienarchiv.service;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
+
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
+
+class OcrProgressServiceTest {
+
+    private final OcrProgressService progressService = new OcrProgressService();
+
+    @Test
+    void register_returnsNonNullEmitter() {
+        UUID jobId = UUID.randomUUID();
+        SseEmitter emitter = progressService.register(jobId);
+        assertThat(emitter).isNotNull();
+    }
+
+    @Test
+    void emit_doesNotThrow_whenNoEmittersRegistered() {
+        assertThatCode(() -> progressService.emit(UUID.randomUUID(), "test", "data"))
+                .doesNotThrowAnyException();
+    }
+
+    @Test
+    void complete_doesNotThrow_whenNoEmittersRegistered() {
+        assertThatCode(() -> progressService.complete(UUID.randomUUID()))
+                .doesNotThrowAnyException();
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/service/OcrServiceTest.java

@@ -0,0 +1,165 @@
+package org.raddatz.familienarchiv.service;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.raddatz.familienarchiv.dto.OcrStatusDTO;
+import org.raddatz.familienarchiv.exception.DomainException;
+import org.raddatz.familienarchiv.exception.ErrorCode;
+import org.raddatz.familienarchiv.model.*;
+import org.raddatz.familienarchiv.repository.OcrJobDocumentRepository;
+import org.raddatz.familienarchiv.repository.OcrJobRepository;
+
+import java.util.Optional;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+import static org.springframework.http.HttpStatus.*;
+
+@ExtendWith(MockitoExtension.class)
+class OcrServiceTest {
+
+    @Mock OcrHealthClient ocrHealthClient;
+    @Mock DocumentService documentService;
+    @Mock OcrJobRepository ocrJobRepository;
+    @Mock OcrJobDocumentRepository ocrJobDocumentRepository;
+    @Mock OcrAsyncRunner ocrAsyncRunner;
+
+    @InjectMocks OcrService ocrService;
+
+    // ─── getJob ──────────────────────────────────────────────────────────────────
+
+    @Test
+    void getJob_returnsJob_whenFound() {
+        UUID jobId = UUID.randomUUID();
+        OcrJob job = OcrJob.builder().id(jobId).status(OcrJobStatus.RUNNING).build();
+        when(ocrJobRepository.findById(jobId)).thenReturn(Optional.of(job));
+
+        OcrJob result = ocrService.getJob(jobId);
+
+        assertThat(result).isEqualTo(job);
+    }
+
+    @Test
+    void getJob_throwsNotFound_whenJobDoesNotExist() {
+        UUID jobId = UUID.randomUUID();
+        when(ocrJobRepository.findById(jobId)).thenReturn(Optional.empty());
+
+        assertThatThrownBy(() -> ocrService.getJob(jobId))
+                .isInstanceOf(DomainException.class)
+                .satisfies(e -> {
+                    DomainException de = (DomainException) e;
+                    assertThat(de.getStatus()).isEqualTo(NOT_FOUND);
+                    assertThat(de.getCode()).isEqualTo(ErrorCode.OCR_JOB_NOT_FOUND);
+                });
+    }
+
+    // ─── getDocumentOcrStatus ───────────────────────────────────────────────────
+
+    @Test
+    void getDocumentOcrStatus_returnsNone_whenNoActiveJob() {
+        UUID docId = UUID.randomUUID();
+        when(ocrJobDocumentRepository.findFirstByDocumentIdAndStatusIn(any(), any()))
+                .thenReturn(Optional.empty());
+
+        OcrStatusDTO result = ocrService.getDocumentOcrStatus(docId);
+
+        assertThat(result.getStatus()).isEqualTo("NONE");
+        assertThat(result.getJobId()).isNull();
+    }
+
+    @Test
+    void getDocumentOcrStatus_returnsActiveStatus_whenJobExists() {
+        UUID docId = UUID.randomUUID();
+        UUID jobId = UUID.randomUUID();
+        OcrJobDocument jobDoc = OcrJobDocument.builder()
+                .jobId(jobId).documentId(docId)
+                .status(OcrDocumentStatus.RUNNING)
+                .currentPage(2).totalPages(5)
+                .build();
+        when(ocrJobDocumentRepository.findFirstByDocumentIdAndStatusIn(any(), any()))
+                .thenReturn(Optional.of(jobDoc));
+
+        OcrStatusDTO result = ocrService.getDocumentOcrStatus(docId);
+
+        assertThat(result.getStatus()).isEqualTo("RUNNING");
+        assertThat(result.getJobId()).isEqualTo(jobId);
+        assertThat(result.getCurrentPage()).isEqualTo(2);
+        assertThat(result.getTotalPages()).isEqualTo(5);
+    }
+
+    // ─── startOcr ───────────────────────────────────────────────────────────────
+
+    @Test
+    void startOcr_throwsBadRequest_whenDocumentIsPlaceholder() {
+        UUID docId = UUID.randomUUID();
+        Document doc = Document.builder().id(docId).status(DocumentStatus.PLACEHOLDER).build();
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+
+        assertThatThrownBy(() -> ocrService.startOcr(docId, null, UUID.randomUUID()))
+                .isInstanceOf(DomainException.class)
+                .satisfies(e -> {
+                    DomainException de = (DomainException) e;
+                    assertThat(de.getStatus()).isEqualTo(BAD_REQUEST);
+                    assertThat(de.getCode()).isEqualTo(ErrorCode.OCR_DOCUMENT_NOT_UPLOADED);
+                });
+    }
+
+    @Test
+    void startOcr_throwsServiceUnavailable_whenOcrServiceIsDown() {
+        UUID docId = UUID.randomUUID();
+        Document doc = Document.builder().id(docId).status(DocumentStatus.UPLOADED)
+                .filePath("test.pdf").build();
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+        when(ocrHealthClient.isHealthy()).thenReturn(false);
+
+        assertThatThrownBy(() -> ocrService.startOcr(docId, null, UUID.randomUUID()))
+                .isInstanceOf(DomainException.class)
+                .satisfies(e -> assertThat(((DomainException) e).getCode())
+                        .isEqualTo(ErrorCode.OCR_SERVICE_UNAVAILABLE));
+    }
+
+    @Test
+    void startOcr_createsJobAndDispatchesAsync() {
+        UUID docId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+        UUID jobId = UUID.randomUUID();
+        Document doc = Document.builder().id(docId).status(DocumentStatus.UPLOADED)
+                .filePath("test.pdf").scriptType(ScriptType.TYPEWRITER).build();
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+        when(ocrHealthClient.isHealthy()).thenReturn(true);
+        when(ocrJobRepository.save(any())).thenAnswer(inv -> {
+            OcrJob job = inv.getArgument(0);
+            job.setId(jobId);
+            return job;
+        });
+
+        UUID result = ocrService.startOcr(docId, null, userId);
+
+        assertThat(result).isEqualTo(jobId);
+        verify(ocrAsyncRunner).runSingleDocument(jobId, docId, userId);
+    }
+
+    @Test
+    void startOcr_updatesScriptType_whenProvided() {
+        UUID docId = UUID.randomUUID();
+        Document doc = Document.builder().id(docId).status(DocumentStatus.UPLOADED)
+                .filePath("test.pdf").scriptType(ScriptType.UNKNOWN).build();
+        when(documentService.getDocumentById(docId)).thenReturn(doc);
+        when(ocrHealthClient.isHealthy()).thenReturn(true);
+        when(ocrJobRepository.save(any())).thenAnswer(inv -> {
+            OcrJob job = inv.getArgument(0);
+            job.setId(UUID.randomUUID());
+            return job;
+        });
+
+        ocrService.startOcr(docId, ScriptType.HANDWRITING_LATIN, UUID.randomUUID());
+
+        verify(documentService).updateScriptType(docId, ScriptType.HANDWRITING_LATIN);
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/service/OcrStreamEventTest.java

@@ -0,0 +1,51 @@
+package org.raddatz.familienarchiv.service;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class OcrStreamEventTest {
+
+    @Test
+    void startRecordHoldsTotalPages() {
+        var start = new OcrStreamEvent.Start(5);
+        assertThat(start.totalPages()).isEqualTo(5);
+        assertThat(start).isInstanceOf(OcrStreamEvent.class);
+    }
+
+    @Test
+    void pageRecordHoldsBlocksAndPageNumber() {
+        var block = new OcrBlockResult(0, 0.1, 0.2, 0.8, 0.1, null, "Test");
+        var page = new OcrStreamEvent.Page(0, List.of(block));
+        assertThat(page.pageNumber()).isEqualTo(0);
+        assertThat(page.blocks()).hasSize(1);
+    }
+
+    @Test
+    void errorRecordHoldsPageAndMessage() {
+        var error = new OcrStreamEvent.Error(2, "failed");
+        assertThat(error.pageNumber()).isEqualTo(2);
+        assertThat(error.message()).isEqualTo("failed");
+    }
+
+    @Test
+    void doneRecordHoldsTotalBlocksAndSkippedPages() {
+        var done = new OcrStreamEvent.Done(12, 2);
+        assertThat(done.totalBlocks()).isEqualTo(12);
+        assertThat(done.skippedPages()).isEqualTo(2);
+    }
+
+    @Test
+    void patternMatchingWorksOnSealedInterface() {
+        OcrStreamEvent event = new OcrStreamEvent.Start(3);
+        String result = switch (event) {
+            case OcrStreamEvent.Start s -> "start:" + s.totalPages();
+            case OcrStreamEvent.Page p -> "page:" + p.pageNumber();
+            case OcrStreamEvent.Error e -> "error:" + e.pageNumber();
+            case OcrStreamEvent.Done d -> "done:" + d.totalBlocks();
+        };
+        assertThat(result).isEqualTo("start:3");
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/service/RestClientOcrClientStreamTest.java

@@ -0,0 +1,134 @@
+package org.raddatz.familienarchiv.service;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class RestClientOcrClientStreamTest {
+
+    @Test
+    void parseNdjsonStream_dispatchesStartPageDoneInOrder() {
+        String ndjson = """
+                {"type":"start","totalPages":2}
+                {"type":"page","pageNumber":0,"blocks":[{"pageNumber":0,"x":0.1,"y":0.2,"width":0.8,"height":0.1,"polygon":null,"text":"Line 1"}]}
+                {"type":"page","pageNumber":1,"blocks":[{"pageNumber":1,"x":0.1,"y":0.3,"width":0.8,"height":0.1,"polygon":null,"text":"Line 2"}]}
+                {"type":"done","totalBlocks":2,"skippedPages":0}
+                """;
+        InputStream stream = new ByteArrayInputStream(ndjson.getBytes(StandardCharsets.UTF_8));
+
+        List<OcrStreamEvent> events = new ArrayList<>();
+        RestClientOcrClient.parseNdjsonStream(stream, events::add);
+
+        assertThat(events).hasSize(4);
+        assertThat(events.get(0)).isInstanceOf(OcrStreamEvent.Start.class);
+        assertThat(((OcrStreamEvent.Start) events.get(0)).totalPages()).isEqualTo(2);
+
+        assertThat(events.get(1)).isInstanceOf(OcrStreamEvent.Page.class);
+        var page0 = (OcrStreamEvent.Page) events.get(1);
+        assertThat(page0.pageNumber()).isEqualTo(0);
+        assertThat(page0.blocks()).hasSize(1);
+        assertThat(page0.blocks().get(0).text()).isEqualTo("Line 1");
+
+        assertThat(events.get(2)).isInstanceOf(OcrStreamEvent.Page.class);
+        var page1 = (OcrStreamEvent.Page) events.get(2);
+        assertThat(page1.pageNumber()).isEqualTo(1);
+
+        assertThat(events.get(3)).isInstanceOf(OcrStreamEvent.Done.class);
+        var done = (OcrStreamEvent.Done) events.get(3);
+        assertThat(done.totalBlocks()).isEqualTo(2);
+        assertThat(done.skippedPages()).isEqualTo(0);
+    }
+
+    @Test
+    void parseNdjsonStream_parsesErrorEvents() {
+        String ndjson = """
+                {"type":"start","totalPages":3}
+                {"type":"page","pageNumber":0,"blocks":[]}
+                {"type":"error","pageNumber":1,"message":"OCR processing failed on page 1"}
+                {"type":"page","pageNumber":2,"blocks":[]}
+                {"type":"done","totalBlocks":0,"skippedPages":1}
+                """;
+        InputStream stream = new ByteArrayInputStream(ndjson.getBytes(StandardCharsets.UTF_8));
+
+        List<OcrStreamEvent> events = new ArrayList<>();
+        RestClientOcrClient.parseNdjsonStream(stream, events::add);
+
+        assertThat(events).hasSize(5);
+        assertThat(events.get(2)).isInstanceOf(OcrStreamEvent.Error.class);
+        var error = (OcrStreamEvent.Error) events.get(2);
+        assertThat(error.pageNumber()).isEqualTo(1);
+        assertThat(error.message()).contains("OCR processing failed");
+    }
+
+    @Test
+    void parseNdjsonStream_skipsBlankLines() {
+        String ndjson = """
+                {"type":"start","totalPages":1}
+
+                {"type":"page","pageNumber":0,"blocks":[]}
+
+                {"type":"done","totalBlocks":0,"skippedPages":0}
+                """;
+        InputStream stream = new ByteArrayInputStream(ndjson.getBytes(StandardCharsets.UTF_8));
+
+        List<OcrStreamEvent> events = new ArrayList<>();
+        RestClientOcrClient.parseNdjsonStream(stream, events::add);
+
+        assertThat(events).hasSize(3);
+    }
+
+    @Test
+    void parseNdjsonStream_ignoresUnknownEventTypes() {
+        String ndjson = """
+                {"type":"start","totalPages":1}
+                {"type":"unknown","foo":"bar"}
+                {"type":"done","totalBlocks":0,"skippedPages":0}
+                """;
+        InputStream stream = new ByteArrayInputStream(ndjson.getBytes(StandardCharsets.UTF_8));
+
+        List<OcrStreamEvent> events = new ArrayList<>();
+        RestClientOcrClient.parseNdjsonStream(stream, events::add);
+
+        assertThat(events).hasSize(2);
+    }
+
+    @Test
+    void parseNdjsonStream_handlesUnknownFieldsInBlocks() {
+        String ndjson = """
+                {"type":"start","totalPages":1}
+                {"type":"page","pageNumber":0,"blocks":[{"pageNumber":0,"x":0.1,"y":0.2,"width":0.8,"height":0.1,"polygon":null,"text":"Line 1","confidence":0.95,"newFutureField":"ignored"}]}
+                {"type":"done","totalBlocks":1,"skippedPages":0}
+                """;
+        InputStream stream = new ByteArrayInputStream(ndjson.getBytes(StandardCharsets.UTF_8));
+
+        List<OcrStreamEvent> events = new ArrayList<>();
+        RestClientOcrClient.parseNdjsonStream(stream, events::add);
+
+        assertThat(events).hasSize(3);
+        var page = (OcrStreamEvent.Page) events.get(1);
+        assertThat(page.blocks().get(0).text()).isEqualTo("Line 1");
+    }
+
+    @Test
+    void parseNdjsonStream_parsesPageWithPolygon() {
+        String ndjson = """
+                {"type":"start","totalPages":1}
+                {"type":"page","pageNumber":0,"blocks":[{"pageNumber":0,"x":0.1,"y":0.2,"width":0.8,"height":0.1,"polygon":[[0.1,0.2],[0.9,0.2],[0.9,0.3],[0.1,0.3]],"text":"With polygon"}]}
+                {"type":"done","totalBlocks":1,"skippedPages":0}
+                """;
+        InputStream stream = new ByteArrayInputStream(ndjson.getBytes(StandardCharsets.UTF_8));
+
+        List<OcrStreamEvent> events = new ArrayList<>();
+        RestClientOcrClient.parseNdjsonStream(stream, events::add);
+
+        var page = (OcrStreamEvent.Page) events.get(1);
+        assertThat(page.blocks().get(0).polygon()).hasSize(4);
+        assertThat(page.blocks().get(0).text()).isEqualTo("With polygon");
+    }
+}

backend/src/test/java/org/raddatz/familienarchiv/service/TranscriptionServiceTest.java

@@ -10,6 +10,7 @@ import org.raddatz.familienarchiv.dto.CreateTranscriptionBlockDTO;
 import org.raddatz.familienarchiv.dto.ReorderTranscriptionBlocksDTO;
 import org.raddatz.familienarchiv.dto.UpdateTranscriptionBlockDTO;
 import org.raddatz.familienarchiv.exception.DomainException;
+import org.raddatz.familienarchiv.model.BlockSource;
 import org.raddatz.familienarchiv.model.Document;
 import org.raddatz.familienarchiv.model.DocumentAnnotation;
 import org.raddatz.familienarchiv.model.TranscriptionBlock;
@@ -26,8 +27,8 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.*;
+
 import static org.springframework.http.HttpStatus.NOT_FOUND;
 
 @ExtendWith(MockitoExtension.class)
@@ -99,6 +100,50 @@ class TranscriptionServiceTest {
         verify(versionRepository).save(any(TranscriptionBlockVersion.class));
     }
 
+    // ─── createOcrBlock ──────────────────────────────────────────────────────────
+
+    @Test
+    void createOcrBlock_createsBlockWithOcrSourceAndSavesVersion() {
+        UUID docId = UUID.randomUUID();
+        UUID annotId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+
+        when(blockRepository.save(any())).thenAnswer(inv -> {
+            TranscriptionBlock b = inv.getArgument(0);
+            b.setId(UUID.randomUUID());
+            return b;
+        });
+
+        TranscriptionBlock result = transcriptionService.createOcrBlock(
+                docId, annotId, "OCR text", 3, userId);
+
+        assertThat(result.getAnnotationId()).isEqualTo(annotId);
+        assertThat(result.getDocumentId()).isEqualTo(docId);
+        assertThat(result.getText()).isEqualTo("OCR text");
+        assertThat(result.getSortOrder()).isEqualTo(3);
+        assertThat(result.getSource()).isEqualTo(BlockSource.OCR);
+        assertThat(result.getCreatedBy()).isEqualTo(userId);
+        verify(versionRepository).save(any(TranscriptionBlockVersion.class));
+    }
+
+    @Test
+    void createOcrBlock_sanitizesNullText() {
+        UUID docId = UUID.randomUUID();
+        UUID annotId = UUID.randomUUID();
+        UUID userId = UUID.randomUUID();
+
+        when(blockRepository.save(any())).thenAnswer(inv -> {
+            TranscriptionBlock b = inv.getArgument(0);
+            b.setId(UUID.randomUUID());
+            return b;
+        });
+
+        TranscriptionBlock result = transcriptionService.createOcrBlock(
+                docId, annotId, null, 0, userId);
+
+        assertThat(result.getText()).isEmpty();
+    }
+
     // ─── updateBlock ─────────────────────────────────────────────────────────────
 
     @Test
@@ -168,6 +213,39 @@ class TranscriptionServiceTest {
                 .satisfies(e -> assertThat(((DomainException) e).getStatus()).isEqualTo(NOT_FOUND));
     }
 
+    // ─── deleteAllBlocksByDocument ─────────────────────────────────────────────
+
+    @Test
+    void deleteAllBlocksByDocument_deletesAllBlocksAndAnnotations() {
+        UUID docId = UUID.randomUUID();
+        UUID annId1 = UUID.randomUUID();
+        UUID annId2 = UUID.randomUUID();
+
+        TranscriptionBlock block1 = TranscriptionBlock.builder()
+                .id(UUID.randomUUID()).documentId(docId).annotationId(annId1).sortOrder(0).build();
+        TranscriptionBlock block2 = TranscriptionBlock.builder()
+                .id(UUID.randomUUID()).documentId(docId).annotationId(annId2).sortOrder(1).build();
+
+        when(blockRepository.findByDocumentIdOrderBySortOrderAsc(docId))
+                .thenReturn(List.of(block1, block2));
+
+        transcriptionService.deleteAllBlocksByDocument(docId);
+
+        verify(blockRepository).deleteAll(List.of(block1, block2));
+        verify(blockRepository).flush();
+        verify(annotationRepository).deleteAllById(List.of(annId1, annId2));
+    }
+
+    @Test
+    void deleteAllBlocksByDocument_doesNothing_whenNoBlocksExist() {
+        UUID docId = UUID.randomUUID();
+        when(blockRepository.findByDocumentIdOrderBySortOrderAsc(docId)).thenReturn(List.of());
+
+        transcriptionService.deleteAllBlocksByDocument(docId);
+
+        verify(blockRepository, never()).deleteAll(any());
+    }
+
     // ─── reorderBlocks ───────────────────────────────────────────────────────────
 
     @Test
@@ -243,4 +321,47 @@ class TranscriptionServiceTest {
 
         assertThat(transcriptionService.listBlocks(docId)).containsExactly(b);
     }
+
+    // ─── reviewBlock ─────────────────────────────────────────────────────────
+
+    @Test
+    void reviewBlock_setsReviewedTrue() {
+        UUID docId = UUID.randomUUID();
+        UUID blockId = UUID.randomUUID();
+        TranscriptionBlock block = TranscriptionBlock.builder()
+                .id(blockId).documentId(docId).annotationId(UUID.randomUUID())
+                .text("corrected text").sortOrder(0).reviewed(false).build();
+        when(blockRepository.findByIdAndDocumentId(blockId, docId)).thenReturn(Optional.of(block));
+        when(blockRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        TranscriptionBlock result = transcriptionService.reviewBlock(docId, blockId);
+
+        assertThat(result.isReviewed()).isTrue();
+        verify(blockRepository).save(block);
+    }
+
+    @Test
+    void reviewBlock_togglesReviewedFalse_whenAlreadyReviewed() {
+        UUID docId = UUID.randomUUID();
+        UUID blockId = UUID.randomUUID();
+        TranscriptionBlock block = TranscriptionBlock.builder()
+                .id(blockId).documentId(docId).annotationId(UUID.randomUUID())
+                .text("corrected text").sortOrder(0).reviewed(true).build();
+        when(blockRepository.findByIdAndDocumentId(blockId, docId)).thenReturn(Optional.of(block));
+        when(blockRepository.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        TranscriptionBlock result = transcriptionService.reviewBlock(docId, blockId);
+
+        assertThat(result.isReviewed()).isFalse();
+    }
+
+    @Test
+    void reviewBlock_throwsNotFound_whenBlockMissing() {
+        UUID docId = UUID.randomUUID();
+        UUID blockId = UUID.randomUUID();
+        when(blockRepository.findByIdAndDocumentId(blockId, docId)).thenReturn(Optional.empty());
+
+        assertThatThrownBy(() -> transcriptionService.reviewBlock(docId, blockId))
+                .isInstanceOf(DomainException.class);
+    }
 }

docker-compose.yml

@@ -71,6 +71,35 @@ services:
     networks:
       - archive-net
 
+  # --- OCR: Python microservice (Surya + Kraken) ---
+  ocr-service:
+    build:
+      context: ./ocr-service
+      dockerfile: Dockerfile
+    container_name: archive-ocr
+    restart: unless-stopped
+    expose:
+      - "8000"
+    mem_limit: 8g
+    memswap_limit: 8g
+    volumes:
+      - ocr_models:/app/models
+      - ocr_cache:/root/.cache
+    environment:
+      KRAKEN_MODEL_PATH: /app/models/german_kurrent.mlmodel
+      OCR_CONFIDENCE_THRESHOLD: "0.3"
+      OCR_CONFIDENCE_THRESHOLD_KURRENT: "0.5"
+      RECOGNITION_BATCH_SIZE: "16"
+      DETECTOR_BATCH_SIZE: "8"
+    networks:
+      - archive-net
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 10s
+      timeout: 5s
+      retries: 12
+      start_period: 60s
+
   # --- Backend: Spring Boot ---
   backend:
     build:
@@ -89,6 +118,8 @@ services:
         condition: service_healthy
       mailpit:
         condition: service_started
+      ocr-service:
+        condition: service_started
     environment:
       SPRING_DATASOURCE_URL: jdbc:postgresql://db:5432/${POSTGRES_DB}
       SPRING_DATASOURCE_USERNAME: ${POSTGRES_USER}
@@ -109,6 +140,7 @@ services:
       # Mailpit needs no auth or STARTTLS; production SMTP overrides these via .env
       SPRING_MAIL_PROPERTIES_MAIL_SMTP_AUTH: ${MAIL_SMTP_AUTH:-false}
       SPRING_MAIL_PROPERTIES_MAIL_SMTP_STARTTLS_ENABLE: ${MAIL_STARTTLS_ENABLE:-false}
+      APP_OCR_BASE_URL: http://ocr-service:8000
     ports:
       - "${PORT_BACKEND}:8080"
     networks:
@@ -155,3 +187,5 @@ networks:
 volumes:
   frontend_node_modules:
   maven_cache:
+  ocr_models:
+  ocr_cache:

docs/adr/001-ocr-python-microservice.md

@@ -0,0 +1,84 @@
+# ADR-001: OCR Python Microservice
+
+## Status
+
+Accepted
+
+## Context
+
+The Familienarchiv needs OCR capability to pre-populate transcription blocks from scanned documents. Two OCR engines are required:
+
+- **Surya** — transformer-based, handles typewritten and modern Latin handwriting
+- **Kraken** — historical HTR model support, required for pre-1941 German Kurrent/Suetterlin scripts
+
+Both engines exist exclusively in the Python ecosystem. There are no production-quality Java bindings for either engine. Tess4J (Tesseract for Java) was considered but rejected: Tesseract has poor accuracy on degraded historical handwriting and no HTR-United model support.
+
+The server has no GPU. CPU-only inference is the target (16-32 GB system RAM).
+
+## Decision
+
+Introduce a separate Python container (`ocr-service`) that exposes a simple HTTP API. Spring Boot calls this service via `RestClient`. The Python service is stateless — all job tracking and business logic remain in Spring Boot.
+
+**Interface contract:**
+
+Request:
+```json
+{
+  "pdfUrl": "http://minio:9000/archive-documents/abc.pdf?presigned...",
+  "scriptType": "HANDWRITING_KURRENT",
+  "language": "de"
+}
+```
+
+Response:
+```json
+[
+  {
+    "pageNumber": 0,
+    "x": 0.12, "y": 0.08, "width": 0.76, "height": 0.04,
+    "polygon": [[0.12,0.08],[0.88,0.09],[0.87,0.12],[0.13,0.11]],
+    "text": "Sehr geehrter Herr ..."
+  }
+]
+```
+
+Coordinates are normalized (0-1) relative to page dimensions.
+
+**Java-side integration:**
+
+- `OcrClient` interface with `extractBlocks()` method — mockable for unit tests
+- `OcrHealthClient` interface with `isHealthy()` — separate concern from block extraction
+- `RestClientOcrClient` implements both interfaces
+- `OcrService` orchestrates: presigned URL generation, OCR call, block mapping, TranscriptionService delegation
+
+**Docker networking:**
+
+- `ocr-service` is on the internal Docker network only — no host port mapping
+- Spring Boot reaches it via `http://ocr-service:8000`
+- Health check with `start_period: 60s` to account for model loading (~30-60s on CPU)
+
+## Alternatives Considered
+
+| Alternative | Why rejected |
+|---|---|
+| Tess4J (Tesseract in Java) | No HTR-United model support; poor Kurrent accuracy |
+| Calling Python via ProcessBuilder | Fragile, no health checks, model reloading on every call |
+| Embedding Python via GraalVM | Experimental, complex dependency management for ML libraries |
+| External SaaS OCR (Google Vision, AWS Textract) | Data sovereignty concern for private family documents; no Kurrent support |
+
+## Consequences
+
+**Easier:**
+- Each engine is used via its native Python API — no bridging complexity
+- OCR service can be updated independently of the main application
+- Models can be swapped via volume mount without code changes
+
+**Harder:**
+- One additional container to operate (memory, health checks, restarts)
+- Integration tests require WireMock stub — real OCR service is too slow for CI
+- Presigned URL TTL must be managed (15-30 min recommended)
+
+## Future Direction
+
+- LISTEN/NOTIFY from PostgreSQL to push progress events when scaling to multiple instances
+- GPU acceleration if the server is upgraded — only the Docker image needs to change

docs/adr/002-polygon-jsonb-storage.md

@@ -0,0 +1,52 @@
+# ADR-002: Polygon JSONB Storage for Annotations
+
+## Status
+
+Accepted
+
+## Context
+
+Document annotations currently store axis-aligned bounding boxes (`x, y, width, height`). Kraken OCR outputs polygon boundaries for text lines — historical handwriting (Kurrent, Suetterlin) produces rotated and curved text that axis-aligned rectangles approximate poorly.
+
+We need to store an optional quadrilateral (4 corner points) per annotation to represent the precise text region. The polygon is display-only — overlap detection and all server-side geometry logic continues to use the AABB fields.
+
+## Decision
+
+Add a `polygon JSONB` column to `document_annotations`:
+
+```sql
+ALTER TABLE document_annotations ADD COLUMN polygon JSONB;
+ALTER TABLE document_annotations
+ADD CONSTRAINT chk_annotation_polygon_quad
+    CHECK (polygon IS NULL OR jsonb_array_length(polygon) = 4);
+```
+
+- `null` means rectangle — render using existing `x, y, width, height` fields (fully backward compatible)
+- Non-null value is a normalized 4-point quadrilateral: `[[x1,y1],[x2,y2],[x3,y3],[x4,y4]]` with coordinates in the 0-1 range relative to page dimensions
+
+The existing AABB fields are always populated (even when a polygon is present) and remain the authoritative geometry for overlap detection.
+
+**Java entity:** `List<List<Double>> polygon` backed by a custom `AttributeConverter<List<List<Double>>, String>`. No new dependency (Hypersistence Utils is not in the project and won't be added for a single column).
+
+**Semantic invariant:** `polygon`, if present, is a 4-point quadrilateral with coordinates normalized to [0, 1] relative to page dimensions. It may originate from OCR engine output (Kraken) or from a future manual drawing tool. The AABB fields remain the geometry source of truth for server-side logic.
+
+## Alternatives Considered
+
+| Alternative | Why rejected |
+|---|---|
+| 8 `NUMERIC(8,6)` columns (x1,y1,...,x4,y4) | Verbose, no structural enforcement, awkward to query or extend |
+| Separate `annotation_polygons` join table | Unnecessary complexity for a 1:1 optional relationship |
+| PostGIS geometry column | Adds a heavyweight extension for a display-only field with no spatial queries |
+| `String polygon` on the entity | Requires manual parsing at every callsite; error-prone |
+
+## Consequences
+
+**Easier:**
+- Backward compatible — all existing annotations continue to work unchanged
+- Frontend renders `<polygon>` or `<rect>` based on a simple null check
+- Schema can accommodate N-point polygons in the future (JSONB is flexible), though the CHECK constraint currently enforces exactly 4
+
+**Harder:**
+- Cannot express range checks (`0 <= x <= 1`) as database constraints without a PL/pgSQL function — validated at the DTO layer instead
+- No server-side geometry queries on polygon coordinates (acceptable — polygon is display-only)
+- AttributeConverter adds a small amount of serialization code to maintain

frontend/messages/de.json

@@ -500,5 +500,37 @@
 	"person_alias_delete_title": "Alias entfernen?",
 	"person_alias_delete_body": "Dieser Name wird aus der Suche entfernt.",
 	"person_alias_btn_delete": "Entfernen",
-	"error_alias_not_found": "Der Namensalias wurde nicht gefunden."
+	"error_alias_not_found": "Der Namensalias wurde nicht gefunden.",
+	"error_ocr_service_unavailable": "Der OCR-Dienst ist nicht verfügbar.",
+	"error_ocr_job_not_found": "Der OCR-Auftrag wurde nicht gefunden.",
+	"error_ocr_document_not_uploaded": "Das Dokument hat keine Datei — OCR ist nicht möglich.",
+	"error_ocr_processing_failed": "Die OCR-Verarbeitung ist fehlgeschlagen.",
+	"ocr_script_type_typewriter": "Schreibmaschine",
+	"ocr_script_type_handwriting_latin": "Handschrift (lateinisch)",
+	"ocr_script_type_handwriting_kurrent": "Handschrift (Kurrent/Sütterlin)",
+	"ocr_trigger_label": "Schrifttyp",
+	"ocr_trigger_select_placeholder": "Schrifttyp wählen…",
+	"ocr_trigger_btn": "OCR starten",
+	"ocr_trigger_btn_disabled": "Bitte wählen Sie einen Schrifttyp",
+	"ocr_confirm_title": "Vorhandene Transkription ersetzen?",
+	"ocr_confirm_body": "Alle {count} vorhandenen Blöcke werden gelöscht und durch die OCR-Ergebnisse ersetzt. Diese Aktion kann nicht rückgängig gemacht werden.",
+	"ocr_confirm_btn": "Ersetzen",
+	"ocr_rerun_label": "OCR erneut ausführen…",
+	"ocr_progress_heading": "OCR läuft",
+	"ocr_progress_page": "Seite {current} von {total}",
+	"ocr_error_heading": "OCR fehlgeschlagen",
+	"ocr_error_retry": "Erneut versuchen",
+	"ocr_batch_running": "OCR läuft · {processed} von {total} Dokumente abgeschlossen",
+	"ocr_batch_done": "OCR abgeschlossen · {processed} erfolgreich · {errors} fehlgeschlagen",
+	"ocr_status_preparing": "Dokument wird vorbereitet…",
+	"ocr_status_loading": "Lade Modell und Dokument…",
+	"ocr_status_analyzing": "OCR-Analyse läuft — dies kann einige Minuten dauern…",
+	"ocr_status_creating_blocks": "{count} Textblöcke erkannt — erstelle Transkription…",
+	"ocr_status_done_blocks": "{count} Blöcke erstellt",
+	"ocr_status_analyzing_page": "Seite {current} von {total} wird analysiert…",
+	"ocr_status_done_skipped": "{count} Blöcke erstellt, {skipped} Seite(n) übersprungen",
+	"ocr_status_error": "OCR fehlgeschlagen",
+	"transcription_block_review": "Als geprüft markieren",
+	"transcription_block_unreview": "Markierung aufheben",
+	"transcription_reviewed_count": "{reviewed} von {total} geprüft"
 }

frontend/messages/en.json

@@ -500,5 +500,37 @@
 	"person_alias_delete_title": "Remove alias?",
 	"person_alias_delete_body": "This name will be removed from search results.",
 	"person_alias_btn_delete": "Remove",
-	"error_alias_not_found": "The name alias was not found."
+	"error_alias_not_found": "The name alias was not found.",
+	"error_ocr_service_unavailable": "The OCR service is not available.",
+	"error_ocr_job_not_found": "The OCR job was not found.",
+	"error_ocr_document_not_uploaded": "The document has no file — OCR is not possible.",
+	"error_ocr_processing_failed": "OCR processing failed.",
+	"ocr_script_type_typewriter": "Typewriter",
+	"ocr_script_type_handwriting_latin": "Handwriting (Latin)",
+	"ocr_script_type_handwriting_kurrent": "Handwriting (Kurrent/Sütterlin)",
+	"ocr_trigger_label": "Script type",
+	"ocr_trigger_select_placeholder": "Select script type…",
+	"ocr_trigger_btn": "Start OCR",
+	"ocr_trigger_btn_disabled": "Please select a script type",
+	"ocr_confirm_title": "Replace existing transcription?",
+	"ocr_confirm_body": "All {count} existing blocks will be deleted and replaced with OCR results. This action cannot be undone.",
+	"ocr_confirm_btn": "Replace",
+	"ocr_rerun_label": "Re-run OCR…",
+	"ocr_progress_heading": "OCR running",
+	"ocr_progress_page": "Page {current} of {total}",
+	"ocr_error_heading": "OCR failed",
+	"ocr_error_retry": "Try again",
+	"ocr_batch_running": "OCR running · {processed} of {total} documents complete",
+	"ocr_batch_done": "OCR complete · {processed} successful · {errors} failed",
+	"ocr_status_preparing": "Preparing document…",
+	"ocr_status_loading": "Loading model and document…",
+	"ocr_status_analyzing": "OCR analysis running — this may take a few minutes…",
+	"ocr_status_creating_blocks": "{count} text blocks detected — creating transcription…",
+	"ocr_status_done_blocks": "{count} blocks created",
+	"ocr_status_analyzing_page": "Analyzing page {current} of {total}…",
+	"ocr_status_done_skipped": "{count} blocks created, {skipped} page(s) skipped",
+	"ocr_status_error": "OCR failed",
+	"transcription_block_review": "Mark as reviewed",
+	"transcription_block_unreview": "Unmark as reviewed",
+	"transcription_reviewed_count": "{reviewed} of {total} reviewed"
 }

frontend/messages/es.json

@@ -500,5 +500,37 @@
 	"person_alias_delete_title": "Eliminar alias?",
 	"person_alias_delete_body": "Este nombre se eliminara de los resultados de busqueda.",
 	"person_alias_btn_delete": "Eliminar",
-	"error_alias_not_found": "No se encontro el alias de nombre."
+	"error_alias_not_found": "No se encontro el alias de nombre.",
+	"error_ocr_service_unavailable": "El servicio OCR no está disponible.",
+	"error_ocr_job_not_found": "No se encontró el trabajo OCR.",
+	"error_ocr_document_not_uploaded": "El documento no tiene archivo — OCR no es posible.",
+	"error_ocr_processing_failed": "El procesamiento OCR ha fallado.",
+	"ocr_script_type_typewriter": "Máquina de escribir",
+	"ocr_script_type_handwriting_latin": "Escritura manuscrita (latina)",
+	"ocr_script_type_handwriting_kurrent": "Escritura manuscrita (Kurrent/Sütterlin)",
+	"ocr_trigger_label": "Tipo de escritura",
+	"ocr_trigger_select_placeholder": "Seleccionar tipo de escritura…",
+	"ocr_trigger_btn": "Iniciar OCR",
+	"ocr_trigger_btn_disabled": "Por favor seleccione un tipo de escritura",
+	"ocr_confirm_title": "¿Reemplazar transcripción existente?",
+	"ocr_confirm_body": "Los {count} bloques existentes serán eliminados y reemplazados con los resultados del OCR. Esta acción no se puede deshacer.",
+	"ocr_confirm_btn": "Reemplazar",
+	"ocr_rerun_label": "Ejecutar OCR de nuevo…",
+	"ocr_progress_heading": "OCR en curso",
+	"ocr_progress_page": "Página {current} de {total}",
+	"ocr_error_heading": "OCR fallido",
+	"ocr_error_retry": "Intentar de nuevo",
+	"ocr_batch_running": "OCR en curso · {processed} de {total} documentos completados",
+	"ocr_batch_done": "OCR completado · {processed} exitosos · {errors} fallidos",
+	"ocr_status_preparing": "Preparando documento…",
+	"ocr_status_loading": "Cargando modelo y documento…",
+	"ocr_status_analyzing": "Análisis OCR en curso — esto puede tardar unos minutos…",
+	"ocr_status_creating_blocks": "{count} bloques de texto detectados — creando transcripción…",
+	"ocr_status_done_blocks": "{count} bloques creados",
+	"ocr_status_analyzing_page": "Analizando página {current} de {total}…",
+	"ocr_status_done_skipped": "{count} bloques creados, {skipped} página(s) omitida(s)",
+	"ocr_status_error": "OCR fallido",
+	"transcription_block_review": "Marcar como revisado",
+	"transcription_block_unreview": "Desmarcar como revisado",
+	"transcription_reviewed_count": "{reviewed} de {total} revisados"
 }

frontend/src/lib/components/AnnotationLayer.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 import type { Annotation } from '$lib/types';
+import AnnotationShape from './AnnotationShape.svelte';
 
 type DrawRect = {
 	x: number;
@@ -33,13 +34,6 @@ let {
 let drawStart = $state<{ x: number; y: number } | null>(null);
 let drawRect = $state<DrawRect | null>(null);
 
-function hexToRgba(hex: string, alpha: number): string {
-	const r = parseInt(hex.slice(1, 3), 16);
-	const g = parseInt(hex.slice(3, 5), 16);
-	const b = parseInt(hex.slice(5, 7), 16);
-	return `rgba(${r}, ${g}, ${b}, ${alpha})`;
-}
-
 function getNormalizedCoords(event: PointerEvent, element: HTMLElement): { x: number; y: number } {
 	const rect = element.getBoundingClientRect();
 	return {
@@ -109,58 +103,18 @@ const containerStyle = $derived(
 	onpointerup={handlePointerUp}
 >
 	{#each annotations as annotation (annotation.id)}
-		<div
-			data-testid="annotation-{annotation.id}"
-			data-annotation
-			class:annotation-flash={flashAnnotationId === annotation.id}
-			role="button"
-			tabindex="0"
-			aria-label="Block anzeigen"
+		<AnnotationShape
+			annotation={annotation}
+			isHovered={hoveredId === annotation.id}
+			isActive={annotation.id === activeAnnotationId}
+			faded={!dimmed && !!activeAnnotationId && annotation.id !== activeAnnotationId}
+			dimmed={dimmed}
+			blockNumber={blockNumbers[annotation.id]}
+			isFlashing={flashAnnotationId === annotation.id}
 			onclick={() => onAnnotationClick?.(annotation.id)}
-			onkeydown={(e) => {
-				if (e.key === 'Enter' || e.key === ' ') onAnnotationClick?.(annotation.id);
-			}}
 			onpointerenter={() => (hoveredId = annotation.id)}
 			onpointerleave={() => (hoveredId = null)}
-			style="
-				position: absolute;
-				left: {annotation.x * 100}%;
-				top: {annotation.y * 100}%;
-				width: {annotation.width * 100}%;
-				height: {annotation.height * 100}%;
-				background-color: {hexToRgba(annotation.color, dimmed ? 0.3 : (hoveredId === annotation.id || annotation.id === activeAnnotationId ? 0.5 : 0.3))};
-				box-shadow: {dimmed ? 'none' : (annotation.id === activeAnnotationId ? `inset 0 0 0 2px ${hexToRgba(annotation.color, 0.8)}` : hoveredId === annotation.id ? `inset 0 0 0 2px ${hexToRgba(annotation.color, 0.8)}` : 'none')};
-				opacity: {dimmed ? 1 : (activeAnnotationId && annotation.id !== activeAnnotationId ? 0.3 : 1)};
-				pointer-events: auto;
-				cursor: pointer;
-				transition: background-color 0.15s ease, box-shadow 0.15s ease, opacity 0.3s ease;
-			"
-		>
-			{#if !dimmed && blockNumbers[annotation.id]}
-				<div
-					style="
-						position: absolute;
-						top: -8px;
-						left: -8px;
-						width: 20px;
-						height: 20px;
-						border-radius: 50%;
-						background-color: {annotation.color};
-						color: white;
-						font-size: 11px;
-						font-family: sans-serif;
-						font-weight: 700;
-						display: flex;
-						align-items: center;
-						justify-content: center;
-						pointer-events: none;
-						box-shadow: 0 1px 3px rgba(0,0,0,0.3);
-					"
-				>
-					{blockNumbers[annotation.id]}
-				</div>
-			{/if}
-		</div>
+		/>
 	{/each}
 
 	{#if drawRect && drawRect.width > 0}
@@ -178,27 +132,3 @@ const containerStyle = $derived(
 		></div>
 	{/if}
 </div>
-
-<style>
-@keyframes annotation-flash-anim {
-	0% {
-		outline: 3px solid color-mix(in srgb, var(--color-turquoise) 80%, transparent);
-		outline-offset: 0px;
-	}
-	100% {
-		outline: 3px solid color-mix(in srgb, var(--color-turquoise) 0%, transparent);
-		outline-offset: 2px;
-	}
-}
-
-.annotation-flash {
-	animation: annotation-flash-anim 1.5s ease-out;
-}
-
-@media (prefers-reduced-motion: reduce) {
-	.annotation-flash {
-		animation: none;
-		outline: 3px solid color-mix(in srgb, var(--color-turquoise) 80%, transparent);
-	}
-}
-</style>

frontend/src/lib/components/AnnotationShape.svelte

@@ -0,0 +1,136 @@
+<script lang="ts">
+import type { Annotation } from '$lib/types';
+
+let {
+	annotation,
+	isHovered,
+	isActive,
+	faded = false,
+	dimmed = false,
+	blockNumber = undefined,
+	isFlashing = false,
+	onclick,
+	onpointerenter,
+	onpointerleave
+}: {
+	annotation: Annotation;
+	isHovered: boolean;
+	isActive: boolean;
+	faded?: boolean;
+	dimmed?: boolean;
+	blockNumber?: number | undefined;
+	isFlashing?: boolean;
+	onclick: () => void;
+	onpointerenter: () => void;
+	onpointerleave: () => void;
+} = $props();
+
+function hexToRgba(hex: string, alpha: number): string {
+	const r = parseInt(hex.slice(1, 3), 16);
+	const g = parseInt(hex.slice(3, 5), 16);
+	const b = parseInt(hex.slice(5, 7), 16);
+	return `rgba(${r}, ${g}, ${b}, ${alpha})`;
+}
+
+let clipPath = $derived.by(() => {
+	if (!annotation.polygon || annotation.polygon.length !== 4) return 'none';
+	const points = annotation.polygon
+		.map(([px, py]) => {
+			const cx = ((px - annotation.x) / annotation.width) * 100;
+			const cy = ((py - annotation.y) / annotation.height) * 100;
+			return `${cx}% ${cy}%`;
+		})
+		.join(', ');
+	return `polygon(${points})`;
+});
+
+let bgAlpha = $derived(dimmed ? 0.3 : isHovered || isActive ? 0.5 : 0.3);
+
+let boxShadow = $derived.by(() => {
+	if (dimmed) return 'none';
+	if (isActive || isHovered) return `inset 0 0 0 2px ${hexToRgba(annotation.color, 0.8)}`;
+	return 'none';
+});
+
+let opacity = $derived(dimmed ? 1 : faded ? 0.3 : 1);
+
+let shapeStyle = $derived(
+	`position: absolute;` +
+		` left: ${annotation.x * 100}%;` +
+		` top: ${annotation.y * 100}%;` +
+		` width: ${annotation.width * 100}%;` +
+		` height: ${annotation.height * 100}%;` +
+		` background-color: ${hexToRgba(annotation.color, bgAlpha)};` +
+		` box-shadow: ${boxShadow};` +
+		` opacity: ${opacity};` +
+		` pointer-events: auto;` +
+		` cursor: pointer;` +
+		` transition: background-color 0.15s ease, box-shadow 0.15s ease, opacity 0.3s ease;` +
+		(clipPath !== 'none' ? ` clip-path: ${clipPath};` : '')
+);
+</script>
+
+<div
+	data-testid="annotation-{annotation.id}"
+	data-annotation
+	class:annotation-flash={isFlashing}
+	role="button"
+	tabindex="0"
+	aria-label="Block anzeigen"
+	onclick={onclick}
+	onkeydown={(e) => {
+		if (e.key === 'Enter' || e.key === ' ') onclick();
+	}}
+	onpointerenter={onpointerenter}
+	onpointerleave={onpointerleave}
+	style={shapeStyle}
+>
+	{#if !dimmed && blockNumber}
+		<div
+			style="
+				position: absolute;
+				top: -8px;
+				left: -8px;
+				width: 20px;
+				height: 20px;
+				border-radius: 50%;
+				background-color: {annotation.color};
+				color: white;
+				font-size: 12px;
+				font-family: sans-serif;
+				font-weight: 700;
+				display: flex;
+				align-items: center;
+				justify-content: center;
+				pointer-events: none;
+				box-shadow: 0 1px 3px rgba(0,0,0,0.3);
+			"
+		>
+			{blockNumber}
+		</div>
+	{/if}
+</div>
+
+<style>
+@keyframes annotation-flash-anim {
+	0% {
+		outline: 3px solid color-mix(in srgb, var(--color-turquoise) 80%, transparent);
+		outline-offset: 0px;
+	}
+	100% {
+		outline: 3px solid color-mix(in srgb, var(--color-turquoise) 0%, transparent);
+		outline-offset: 2px;
+	}
+}
+
+.annotation-flash {
+	animation: annotation-flash-anim 1.5s ease-out;
+}
+
+@media (prefers-reduced-motion: reduce) {
+	.annotation-flash {
+		animation: none;
+		outline: 3px solid color-mix(in srgb, var(--color-turquoise) 80%, transparent);
+	}
+}
+</style>

frontend/src/lib/components/OcrProgress.svelte

@@ -0,0 +1,91 @@
+<script lang="ts">
+import { m } from '$lib/paraglide/messages.js';
+
+interface Props {
+	jobId: string;
+	onDone: () => void;
+}
+
+let { jobId, onDone }: Props = $props();
+
+let status: 'running' | 'done' | 'error' = $state('running');
+let processed: number = $state(0);
+let total: number = $state(0);
+let currentPage: number = $state(0);
+let totalPages: number = $state(0);
+let retryCount: number = $state(0);
+
+let progressPercent = $derived(total > 0 ? Math.round((processed / total) * 100) : 0);
+
+$effect(() => {
+	void retryCount; // track dependency to re-create EventSource on retry
+	const source = new EventSource(`/api/ocr/jobs/${jobId}/progress`);
+
+	source.addEventListener('document', (e) => {
+		const data = JSON.parse(e.data);
+		processed = data.processed;
+		total = data.total;
+	});
+
+	source.addEventListener('page', (e) => {
+		const data = JSON.parse(e.data);
+		currentPage = data.page;
+		totalPages = data.totalPages;
+	});
+
+	source.addEventListener('done', () => {
+		status = 'done';
+		source.close();
+		onDone();
+	});
+
+	source.addEventListener('error', () => {
+		status = 'error';
+		source.close();
+	});
+
+	source.onerror = () => {
+		status = 'error';
+		source.close();
+	};
+
+	return () => {
+		source.close();
+	};
+});
+</script>
+
+{#if status === 'running'}
+	<div class="border-brand-sand rounded-sm border bg-white p-4">
+		<h3 class="mb-3 text-xs font-bold tracking-widest text-gray-400 uppercase">
+			{m.ocr_progress_heading()}
+		</h3>
+		<div class="bg-brand-sand h-2 w-full overflow-hidden rounded-full">
+			<div
+				class="h-full bg-brand-mint transition-all duration-300"
+				style="width: {progressPercent}%"
+				role="progressbar"
+				aria-label={m.ocr_progress_heading()}
+				aria-valuenow={progressPercent}
+				aria-valuemin={0}
+				aria-valuemax={100}
+			></div>
+		</div>
+		<p class="mt-2 text-right text-sm text-gray-500">
+			{m.ocr_progress_page({ current: String(currentPage), total: String(totalPages) })}
+		</p>
+	</div>
+{:else if status === 'error'}
+	<div class="border-brand-sand rounded-sm border border-l-4 border-l-red-500 bg-white p-4">
+		<h3 class="mb-2 text-sm font-semibold text-red-700">
+			{m.ocr_error_heading()}
+		</h3>
+		<button
+			type="button"
+			onclick={() => { retryCount++; status = 'running'; }}
+			class="text-sm font-medium text-brand-navy transition-colors hover:text-brand-navy/80"
+		>
+			{m.ocr_error_retry()}
+		</button>
+	</div>
+{/if}

frontend/src/lib/components/OcrTrigger.svelte

@@ -0,0 +1,49 @@
+<script lang="ts">
+import { untrack } from 'svelte';
+import { m } from '$lib/paraglide/messages.js';
+import { getConfirmService } from '$lib/services/confirm.svelte';
+import ScriptTypeSelect from './ScriptTypeSelect.svelte';
+
+interface Props {
+	existingBlockCount: number;
+	storedScriptType: string;
+	onTrigger: (scriptType: string) => void;
+}
+
+let { existingBlockCount, storedScriptType, onTrigger }: Props = $props();
+
+const { confirm } = getConfirmService();
+
+let selectedScriptType: string = $state(
+	untrack(() => (storedScriptType && storedScriptType !== 'UNKNOWN' ? storedScriptType : ''))
+);
+
+async function handleClick() {
+	if (!selectedScriptType) return;
+
+	if (existingBlockCount > 0) {
+		const confirmed = await confirm({
+			title: m.ocr_confirm_title(),
+			body: m.ocr_confirm_body({ count: String(existingBlockCount) }),
+			confirmLabel: m.ocr_confirm_btn(),
+			destructive: true
+		});
+		if (!confirmed) return;
+	}
+
+	onTrigger(selectedScriptType);
+}
+</script>
+
+<div class="flex flex-col gap-3">
+	<ScriptTypeSelect bind:value={selectedScriptType} />
+	<button
+		type="button"
+		disabled={!selectedScriptType}
+		title={!selectedScriptType ? m.ocr_trigger_btn_disabled() : undefined}
+		onclick={handleClick}
+		class="min-h-[44px] w-full rounded-sm bg-brand-navy font-sans text-sm font-medium text-white transition-colors hover:bg-brand-navy/90 disabled:cursor-not-allowed disabled:opacity-50"
+	>
+		{m.ocr_trigger_btn()}
+	</button>
+</div>

frontend/src/lib/components/PdfViewer.svelte

@@ -145,6 +145,7 @@ async function renderPage(doc: PDFDocumentProxy, pageNum: number) {
 
 	// Text layer
 	const textDiv = textLayerEl;
+	if (!textDiv) return;
 	textDiv.innerHTML = '';
 	textDiv.style.width = `${viewport.width / dpr}px`;
 	textDiv.style.height = `${viewport.height / dpr}px`;

frontend/src/lib/components/ScriptTypeSelect.svelte

@@ -0,0 +1,27 @@
+<script lang="ts">
+import { m } from '$lib/paraglide/messages.js';
+
+interface Props {
+	value: string;
+	disabled?: boolean;
+}
+
+let { value = $bindable(), disabled = false }: Props = $props();
+</script>
+
+<div>
+	<label for="script-type-select" class="text-sm font-bold tracking-widest text-gray-400 uppercase">
+		{m.ocr_trigger_label()}
+	</label>
+	<select
+		id="script-type-select"
+		bind:value={value}
+		disabled={disabled}
+		class="border-brand-sand min-h-[44px] w-full rounded-sm border bg-white px-3 py-2 font-serif text-sm text-brand-navy focus:ring-2 focus:ring-brand-mint focus:outline-none"
+	>
+		<option value="" disabled>{m.ocr_trigger_select_placeholder()}</option>
+		<option value="TYPEWRITER">{m.ocr_script_type_typewriter()}</option>
+		<option value="HANDWRITING_LATIN">{m.ocr_script_type_handwriting_latin()}</option>
+		<option value="HANDWRITING_KURRENT">{m.ocr_script_type_handwriting_kurrent()}</option>
+	</select>
+</div>

frontend/src/lib/components/TranscriptionBlock.svelte

@@ -14,6 +14,7 @@ type Props = {
 	text: string;
 	label: string | null;
 	active: boolean;
+	reviewed: boolean;
 	saveState: SaveState;
 	canComment: boolean;
 	currentUserId: string | null;
@@ -21,6 +22,7 @@ type Props = {
 	onFocus: () => void;
 	onDeleteClick: () => void;
 	onRetry: () => void;
+	onReviewToggle: () => void;
 	onMoveUp?: () => void;
 	onMoveDown?: () => void;
 	isFirst?: boolean;
@@ -34,6 +36,7 @@ let {
 	text,
 	label = null,
 	active,
+	reviewed,
 	saveState,
 	canComment,
 	currentUserId,
@@ -41,6 +44,7 @@ let {
 	onFocus,
 	onDeleteClick,
 	onRetry,
+	onReviewToggle,
 	onMoveUp,
 	onMoveDown,
 	isFirst = false,
@@ -239,6 +243,29 @@ function handleTextareaMouseUp() {
 					</span>
 				{/if}
 
+				<!-- Review toggle -->
+				<button
+					type="button"
+					class="cursor-pointer transition-colors {reviewed ? 'text-turquoise hover:text-turquoise/70' : 'text-ink-3 hover:text-turquoise'}"
+					aria-label={reviewed ? m.transcription_block_unreview() : m.transcription_block_review()}
+					title={reviewed ? m.transcription_block_unreview() : m.transcription_block_review()}
+					onclick={onReviewToggle}
+				>
+					<svg
+						class="h-4 w-4"
+						fill={reviewed ? 'currentColor' : 'none'}
+						viewBox="0 0 24 24"
+						stroke="currentColor"
+						stroke-width="1.5"
+					>
+						<path
+							stroke-linecap="round"
+							stroke-linejoin="round"
+							d="M9 12.75L11.25 15 15 9.75M21 12a9 9 0 11-18 0 9 9 0 0118 0z"
+						/>
+					</svg>
+				</button>
+
 				<!-- Delete button -->
 				<button
 					type="button"

frontend/src/lib/components/TranscriptionEditView.svelte

@@ -2,6 +2,7 @@
 import { m } from '$lib/paraglide/messages.js';
 import { SvelteMap } from 'svelte/reactivity';
 import TranscriptionBlock from './TranscriptionBlock.svelte';
+import OcrTrigger from './OcrTrigger.svelte';
 import type { TranscriptionBlockData } from '$lib/types';
 
 type SaveState = 'idle' | 'saving' | 'saved' | 'fading' | 'error';
@@ -12,9 +13,13 @@ type Props = {
 	canComment: boolean;
 	currentUserId: string | null;
 	activeAnnotationId?: string | null;
+	storedScriptType?: string;
+	canRunOcr?: boolean;
 	onBlockFocus: (blockId: string) => void;
 	onSaveBlock: (blockId: string, text: string) => Promise<void>;
 	onDeleteBlock: (blockId: string) => Promise<void>;
+	onReviewToggle: (blockId: string) => Promise<void>;
+	onTriggerOcr?: (scriptType: string) => void;
 };
 
 let {
@@ -23,9 +28,13 @@ let {
 	canComment,
 	currentUserId,
 	activeAnnotationId = null,
+	storedScriptType = '',
+	canRunOcr = false,
 	onBlockFocus,
 	onSaveBlock,
-	onDeleteBlock
+	onDeleteBlock,
+	onReviewToggle,
+	onTriggerOcr
 }: Props = $props();
 
 let activeBlockId: string | null = $state(null);
@@ -282,6 +291,7 @@ $effect(() => {
 						text={block.text}
 						label={block.label}
 						active={activeBlockId === block.id}
+						reviewed={block.reviewed ?? false}
 						saveState={getSaveState(block.id)}
 						canComment={canComment}
 						currentUserId={currentUserId}
@@ -289,6 +299,7 @@ $effect(() => {
 						onFocus={() => handleFocus(block.id)}
 						onDeleteClick={() => handleDelete(block.id)}
 						onRetry={() => handleRetry(block.id)}
+						onReviewToggle={() => onReviewToggle(block.id)}
 						onMoveUp={() => handleMoveUp(block.id)}
 						onMoveDown={() => handleMoveDown(block.id)}
 						isFirst={i === 0}
@@ -307,6 +318,23 @@ $effect(() => {
 			>
 				{m.transcription_next_block_cta({ number: sortedBlocks.length + 1 })}
 			</div>
+
+			{#if canRunOcr && onTriggerOcr}
+				<details class="mt-6">
+					<summary
+						class="cursor-pointer font-sans text-xs font-medium text-ink-3 transition-colors hover:text-brand-navy"
+					>
+						{m.ocr_rerun_label()}
+					</summary>
+					<div class="mt-3 max-w-xs">
+						<OcrTrigger
+							existingBlockCount={blocks.length}
+							storedScriptType={storedScriptType}
+							onTrigger={onTriggerOcr}
+						/>
+					</div>
+				</details>
+			{/if}
 		</div>
 	{:else}
 		<div class="flex flex-1 flex-col items-center justify-center px-6 py-12 text-center">
@@ -323,9 +351,26 @@ $effect(() => {
 					d="M19.5 14.25v-2.625a3.375 3.375 0 00-3.375-3.375h-1.5A1.125 1.125 0 0113.5 7.125v-1.5a3.375 3.375 0 00-3.375-3.375H8.25m0 12.75h7.5m-7.5 3H12M10.5 2.25H5.625c-.621 0-1.125.504-1.125 1.125v17.25c0 .621.504 1.125 1.125 1.125h12.75c.621 0 1.125-.504 1.125-1.125V11.25a9 9 0 00-9-9z"
 				/>
 			</svg>
-			<p class="max-w-xs text-sm leading-relaxed text-ink-3">
-				{m.transcription_empty_cta()}
-			</p>
+
+			{#if canRunOcr && onTriggerOcr}
+				<p class="mb-6 max-w-xs text-sm leading-relaxed text-ink-3">
+					{m.transcription_empty_title()}
+				</p>
+				<div class="w-full max-w-xs">
+					<OcrTrigger
+						existingBlockCount={0}
+						storedScriptType={storedScriptType}
+						onTrigger={onTriggerOcr}
+					/>
+				</div>
+				<p class="mt-4 text-xs text-ink-3">
+					{m.transcription_empty_desc()}
+				</p>
+			{:else}
+				<p class="max-w-xs text-sm leading-relaxed text-ink-3">
+					{m.transcription_empty_cta()}
+				</p>
+			{/if}
 		</div>
 	{/if}
 </div>

frontend/src/lib/errors.ts

@@ -22,6 +22,10 @@ export type ErrorCode =
 	| 'TRANSCRIPTION_BLOCK_NOT_FOUND'
 	| 'TRANSCRIPTION_BLOCK_CONFLICT'
 	| 'COMMENT_NOT_FOUND'
+	| 'OCR_SERVICE_UNAVAILABLE'
+	| 'OCR_JOB_NOT_FOUND'
+	| 'OCR_DOCUMENT_NOT_UPLOADED'
+	| 'OCR_PROCESSING_FAILED'
 	| 'UNAUTHORIZED'
 	| 'FORBIDDEN'
 	| 'VALIDATION_ERROR'
@@ -85,6 +89,14 @@ export function getErrorMessage(code: ErrorCode | string | undefined): string {
 			return m.error_transcription_block_conflict();
 		case 'COMMENT_NOT_FOUND':
 			return m.error_comment_not_found();
+		case 'OCR_SERVICE_UNAVAILABLE':
+			return m.error_ocr_service_unavailable();
+		case 'OCR_JOB_NOT_FOUND':
+			return m.error_ocr_job_not_found();
+		case 'OCR_DOCUMENT_NOT_UPLOADED':
+			return m.error_ocr_document_not_uploaded();
+		case 'OCR_PROCESSING_FAILED':
+			return m.error_ocr_processing_failed();
 		case 'UNAUTHORIZED':
 			return m.error_unauthorized();
 		case 'FORBIDDEN':

frontend/src/lib/ocr/translateOcrProgress.spec.ts

@@ -0,0 +1,78 @@
+import { describe, it, expect, vi } from 'vitest';
+
+vi.mock('$lib/paraglide/messages.js', () => ({
+	m: {
+		ocr_progress_heading: () => 'OCR-Analyse',
+		ocr_status_preparing: () => 'Dokument wird vorbereitet…',
+		ocr_status_loading: () => 'Lade Modell und Dokument…',
+		ocr_status_analyzing: () => 'OCR-Analyse läuft…',
+		ocr_status_creating_blocks: ({ count }: { count: string }) => `${count} Textblöcke erkannt`,
+		ocr_status_done_blocks: ({ count }: { count: string }) => `${count} Blöcke erstellt`,
+		ocr_status_done_skipped: ({ count, skipped }: { count: string; skipped: string }) =>
+			`${count} Blöcke erstellt, ${skipped} Seite(n) übersprungen`,
+		ocr_status_analyzing_page: ({ current, total }: { current: string; total: string }) =>
+			`Seite ${current} von ${total} wird analysiert…`,
+		ocr_status_error: () => 'OCR fehlgeschlagen'
+	}
+}));
+
+import { translateOcrProgress } from './translateOcrProgress';
+
+describe('translateOcrProgress', () => {
+	it('returns heading for empty code', () => {
+		const result = translateOcrProgress('');
+		expect(result.message).toBe('OCR-Analyse');
+	});
+
+	it('translates PREPARING', () => {
+		const result = translateOcrProgress('PREPARING');
+		expect(result.message).toBe('Dokument wird vorbereitet…');
+		expect(result.currentPage).toBeUndefined();
+		expect(result.totalPages).toBeUndefined();
+	});
+
+	it('translates LOADING', () => {
+		expect(translateOcrProgress('LOADING').message).toBe('Lade Modell und Dokument…');
+	});
+
+	it('translates ANALYZING', () => {
+		expect(translateOcrProgress('ANALYZING').message).toBe('OCR-Analyse läuft…');
+	});
+
+	it('translates CREATING_BLOCKS with count', () => {
+		expect(translateOcrProgress('CREATING_BLOCKS:42').message).toBe('42 Textblöcke erkannt');
+	});
+
+	it('translates DONE without skipped pages', () => {
+		const result = translateOcrProgress('DONE:15');
+		expect(result.message).toBe('15 Blöcke erstellt');
+		expect(result.skippedPages).toBeUndefined();
+	});
+
+	it('translates DONE with zero skipped', () => {
+		const result = translateOcrProgress('DONE:15:0');
+		expect(result.message).toBe('15 Blöcke erstellt');
+		expect(result.skippedPages).toBeUndefined();
+	});
+
+	it('translates DONE with skipped pages', () => {
+		const result = translateOcrProgress('DONE:12:2');
+		expect(result.message).toBe('12 Blöcke erstellt, 2 Seite(n) übersprungen');
+		expect(result.skippedPages).toBe(2);
+	});
+
+	it('translates ANALYZING_PAGE with current, total, and blocks', () => {
+		const result = translateOcrProgress('ANALYZING_PAGE:2:5:10');
+		expect(result.message).toBe('Seite 2 von 5 wird analysiert…');
+		expect(result.currentPage).toBe(2);
+		expect(result.totalPages).toBe(5);
+	});
+
+	it('translates ERROR', () => {
+		expect(translateOcrProgress('ERROR').message).toBe('OCR fehlgeschlagen');
+	});
+
+	it('returns raw code for unknown codes', () => {
+		expect(translateOcrProgress('UNKNOWN_CODE').message).toBe('UNKNOWN_CODE');
+	});
+});

frontend/src/lib/ocr/translateOcrProgress.ts

@@ -0,0 +1,56 @@
+import { m } from '$lib/paraglide/messages.js';
+
+export interface OcrProgressResult {
+	message: string;
+	currentPage?: number;
+	totalPages?: number;
+	skippedPages?: number;
+}
+
+export function translateOcrProgress(code: string): OcrProgressResult {
+	if (!code) return { message: m.ocr_progress_heading() };
+
+	const parts = code.split(':');
+	const key = parts[0];
+
+	switch (key) {
+		case 'PREPARING':
+			return { message: m.ocr_status_preparing() };
+		case 'LOADING':
+			return { message: m.ocr_status_loading() };
+		case 'ANALYZING':
+			return { message: m.ocr_status_analyzing() };
+		case 'CREATING_BLOCKS':
+			return { message: m.ocr_status_creating_blocks({ count: parts[1] ?? '0' }) };
+		case 'DONE': {
+			const count = parts[1] ?? '0';
+			const skipped = parts[2] ? parseInt(parts[2], 10) : 0;
+			if (skipped > 0) {
+				return {
+					message: m.ocr_status_done_skipped({
+						count,
+						skipped: String(skipped)
+					}),
+					skippedPages: skipped
+				};
+			}
+			return { message: m.ocr_status_done_blocks({ count }) };
+		}
+		case 'ANALYZING_PAGE': {
+			const current = parseInt(parts[1] ?? '0', 10);
+			const total = parseInt(parts[2] ?? '0', 10);
+			return {
+				message: m.ocr_status_analyzing_page({
+					current: String(current),
+					total: String(total)
+				}),
+				currentPage: current,
+				totalPages: total
+			};
+		}
+		case 'ERROR':
+			return { message: m.ocr_status_error() };
+		default:
+			return { message: code };
+	}
+}

frontend/src/lib/types.ts

@@ -35,6 +35,8 @@ export type TranscriptionBlockData = {
 	label: string | null;
 	sortOrder: number;
 	version: number;
+	source: 'MANUAL' | 'OCR';
+	reviewed: boolean;
 	updatedAt?: string | null;
 };
 
@@ -49,4 +51,5 @@ export type Annotation = {
 	color: string;
 	createdAt: string;
 	fileHash?: string | null;
+	polygon?: [number, number][] | null;
 };

frontend/src/routes/documents/[id]/+page.svelte

@@ -7,6 +7,8 @@ import TranscriptionEditView from '$lib/components/TranscriptionEditView.svelte'
 import TranscriptionReadView from '$lib/components/TranscriptionReadView.svelte';
 import TranscriptionPanelHeader from '$lib/components/TranscriptionPanelHeader.svelte';
 import type { TranscriptionBlockData } from '$lib/types';
+import { getErrorMessage } from '$lib/errors';
+import { translateOcrProgress } from '$lib/ocr/translateOcrProgress';
 
 let { data } = $props();
 
@@ -118,6 +120,78 @@ async function deleteBlock(blockId: string) {
 	annotationReloadKey++;
 }
 
+async function reviewToggle(blockId: string) {
+	const res = await fetch(`/api/documents/${doc.id}/transcription-blocks/${blockId}/review`, {
+		method: 'PUT'
+	});
+	if (!res.ok) return;
+	const updated = await res.json();
+	transcriptionBlocks = transcriptionBlocks.map((b) => (b.id === blockId ? updated : b));
+}
+
+let ocrRunning = $state(false);
+let ocrProgressMessage = $state('');
+let ocrErrorMessage = $state('');
+let ocrPollTimer = $state<ReturnType<typeof setInterval> | null>(null);
+let ocrSkippedPages = $state(0);
+
+async function triggerOcr(scriptType: string) {
+	ocrRunning = true;
+	ocrErrorMessage = '';
+	try {
+		const res = await fetch(`/api/documents/${doc.id}/ocr`, {
+			method: 'POST',
+			headers: { 'Content-Type': 'application/json' },
+			body: JSON.stringify({ scriptType })
+		});
+		if (res.ok) {
+			const data = await res.json();
+			pollOcrJob(data.jobId);
+		} else {
+			ocrRunning = false;
+			const body = await res.json().catch(() => null);
+			const code = (body as { code?: string } | null)?.code;
+			ocrErrorMessage = code ? getErrorMessage(code) : m.ocr_status_error();
+		}
+	} catch (e) {
+		console.error('Failed to trigger OCR:', e);
+		ocrRunning = false;
+		ocrErrorMessage = m.ocr_status_error();
+	}
+}
+
+function pollOcrJob(jobId: string) {
+	if (ocrPollTimer) clearInterval(ocrPollTimer);
+	ocrPollTimer = setInterval(async () => {
+		try {
+			const res = await fetch(`/api/ocr/jobs/${jobId}`);
+			if (!res.ok) return;
+			const job = await res.json();
+			const rawCode = job.progressMessage ?? '';
+			const progress = translateOcrProgress(rawCode);
+			ocrProgressMessage = progress.message;
+			if (progress.skippedPages !== undefined) ocrSkippedPages = progress.skippedPages;
+			if (job.status === 'DONE' || job.status === 'FAILED') {
+				if (ocrPollTimer) clearInterval(ocrPollTimer);
+				ocrPollTimer = null;
+				setTimeout(() => {
+					ocrRunning = false;
+					ocrProgressMessage = '';
+					ocrSkippedPages = 0;
+				}, 1000);
+				if (job.status === 'FAILED') {
+					ocrErrorMessage = m.ocr_status_error();
+				}
+				await loadTranscriptionBlocks();
+				annotationReloadKey++;
+				panelMode = transcriptionBlocks.length > 0 ? 'read' : 'edit';
+			}
+		} catch {
+			// polling is best-effort
+		}
+	}, 2000);
+}
+
 async function createBlockFromDraw(rect: {
 	x: number;
 	y: number;
@@ -198,12 +272,28 @@ function handleParagraphClick(annotationId: string) {
 	);
 }
 
-// Load blocks when transcribe mode is entered and set default panel mode
+async function checkOcrStatus() {
+	if (!doc?.id) return;
+	try {
+		const res = await fetch(`/api/documents/${doc.id}/ocr-status`);
+		if (!res.ok) return;
+		const status = await res.json();
+		if ((status.status === 'PENDING' || status.status === 'RUNNING') && status.jobId) {
+			ocrRunning = true;
+			pollOcrJob(status.jobId);
+		}
+	} catch {
+		// best-effort
+	}
+}
+
+// Load blocks and check OCR status when transcribe mode is entered
 $effect(() => {
 	if (transcribeMode) {
 		loadTranscriptionBlocks().then(() => {
 			panelMode = transcriptionBlocks.length > 0 ? 'read' : 'edit';
 		});
+		checkOcrStatus();
 	}
 });
 
@@ -227,7 +317,10 @@ onMount(() => {
 		}
 	}
 	document.addEventListener('keydown', onKeyDown);
-	return () => document.removeEventListener('keydown', onKeyDown);
+	return () => {
+		document.removeEventListener('keydown', onKeyDown);
+		if (ocrPollTimer) clearInterval(ocrPollTimer);
+	};
 });
 </script>
 
@@ -258,7 +351,7 @@ onMount(() => {
 				fileUrl={fileUrl}
 				isLoading={isLoading}
 				error={fileError}
-				transcribeMode={transcribeMode}
+				transcribeMode={transcribeMode && !ocrRunning}
 				blockNumbers={blockNumbers}
 				annotationReloadKey={annotationReloadKey}
 				annotationsDimmed={transcribeMode && panelMode === 'read'}
@@ -303,7 +396,45 @@ onMount(() => {
 					onClose={() => (transcribeMode = false)}
 				/>
 				<div class="flex-1 overflow-y-auto">
-					{#if panelMode === 'read'}
+					{#if ocrErrorMessage}
+						<div class="mx-4 mt-4 rounded-sm border border-red-200 bg-red-50 px-4 py-3">
+							<p class="text-sm text-red-700">{ocrErrorMessage}</p>
+						</div>
+					{/if}
+					{#if ocrRunning}
+						<div class="flex flex-1 flex-col items-center justify-center px-6 py-12 text-center">
+							<svg
+								class="mb-4 h-8 w-8 animate-spin text-brand-mint"
+								viewBox="0 0 24 24"
+								fill="none"
+							>
+								<circle
+									class="opacity-25"
+									cx="12"
+									cy="12"
+									r="10"
+									stroke="currentColor"
+									stroke-width="4"
+								></circle>
+								<path
+									class="opacity-75"
+									fill="currentColor"
+									d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"
+								></path>
+							</svg>
+							<p class="text-xs font-bold tracking-widest text-gray-400 uppercase">
+								{m.ocr_progress_heading()}
+							</p>
+							<p class="mt-2 text-sm text-ink-2">
+								{ocrProgressMessage}
+							</p>
+							{#if ocrSkippedPages > 0}
+								<p class="mt-1 text-xs text-amber-600">
+									{ocrSkippedPages} Seiten übersprungen
+								</p>
+							{/if}
+						</div>
+					{:else if panelMode === 'read'}
 						<TranscriptionReadView
 							blocks={transcriptionBlocks}
 							highlightBlockId={highlightBlockId}
@@ -316,9 +447,13 @@ onMount(() => {
 							canComment={canWrite}
 							currentUserId={currentUserId}
 							activeAnnotationId={activeAnnotationId}
+							storedScriptType={doc.scriptType ?? ''}
+							canRunOcr={canWrite && !!doc.filePath}
 							onBlockFocus={handleBlockFocus}
 							onSaveBlock={saveBlock}
 							onDeleteBlock={deleteBlock}
+							onReviewToggle={reviewToggle}
+							onTriggerOcr={triggerOcr}
 						/>
 					{/if}
 				</div>

ocr-service/.dockerignore

@@ -0,0 +1,6 @@
+__pycache__
+*.pyc
+.venv
+models/
+.git
+.pytest_cache

ocr-service/Dockerfile

@@ -0,0 +1,26 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# curl for healthcheck; libgomp1 for PyTorch CPU threading; libvips for kraken PDF support
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    libgomp1 \
+    libvips42 \
+    && rm -rf /var/lib/apt/lists/*
+
+# PyTorch CPU-only — separate layer; the whl/cpu index strips all CUDA variants (~2 GB saved)
+# torchvision must also come from the CPU index to match torch's operator registrations
+RUN pip install --no-cache-dir \
+    torch==2.7.1 \
+    torchvision==0.22.1 \
+    --index-url https://download.pytorch.org/whl/cpu
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 8000
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

ocr-service/confidence.py

@@ -0,0 +1,90 @@
+"""Confidence-based [unleserlich] marker insertion for OCR output."""
+
+import os
+
+THRESHOLD_DEFAULT = float(os.environ.get("OCR_CONFIDENCE_THRESHOLD", "0.3"))
+THRESHOLD_KURRENT = float(os.environ.get("OCR_CONFIDENCE_THRESHOLD_KURRENT", "0.5"))
+
+ILLEGIBLE_MARKER = "[unleserlich]"
+
+
+def get_threshold(script_type: str) -> float:
+    if script_type and script_type.upper() == "HANDWRITING_KURRENT":
+        return THRESHOLD_KURRENT
+    return THRESHOLD_DEFAULT
+
+
+def apply_confidence_markers(words: list[dict], threshold: float | None = None) -> str:
+    """Replace low-confidence words with [unleserlich], collapsing adjacent markers.
+
+    Args:
+        words: list of {"text": str, "confidence": float} dicts
+        threshold: confidence threshold (uses THRESHOLD_DEFAULT if None)
+
+    Returns:
+        Reconstructed text string with [unleserlich] substitutions.
+    """
+    if not words:
+        return ""
+
+    if threshold is None:
+        threshold = THRESHOLD_DEFAULT
+
+    result: list[str] = []
+    prev_was_marker = False
+
+    for word in words:
+        if word["confidence"] < threshold:
+            if not prev_was_marker:
+                result.append(ILLEGIBLE_MARKER)
+            prev_was_marker = True
+        else:
+            result.append(word["text"])
+            prev_was_marker = False
+
+    return " ".join(result)
+
+
+def words_from_characters(prediction: str, confidences: list[float]) -> list[dict]:
+    """Reconstruct word-level confidence from character-level data.
+
+    Splits prediction on whitespace, maps characters to their confidences,
+    computes mean confidence per word.
+
+    Args:
+        prediction: full line text from Kraken
+        confidences: per-character confidence list (same length as prediction)
+
+    Returns:
+        list of {"text": str, "confidence": float} dicts
+    """
+    if not prediction or not prediction.strip():
+        return []
+
+    if len(confidences) != len(prediction):
+        return [{"text": prediction, "confidence": 1.0}]
+
+    result: list[dict] = []
+    current_word: list[str] = []
+    current_confs: list[float] = []
+
+    for char, conf in zip(prediction, confidences):
+        if char == " ":
+            if current_word:
+                result.append({
+                    "text": "".join(current_word),
+                    "confidence": sum(current_confs) / len(current_confs),
+                })
+                current_word = []
+                current_confs = []
+        else:
+            current_word.append(char)
+            current_confs.append(conf)
+
+    if current_word:
+        result.append({
+            "text": "".join(current_word),
+            "confidence": sum(current_confs) / len(current_confs),
+        })
+
+    return result

ocr-service/engines/kraken.py

@@ -0,0 +1,200 @@
+"""Kraken OCR engine wrapper — historical HTR model support for Kurrent/Suetterlin."""
+
+import logging
+import os
+
+logger = logging.getLogger(__name__)
+
+_model = None
+_model_path = os.environ.get("KRAKEN_MODEL_PATH", "/app/models/german_kurrent.mlmodel")
+
+
+def load_models():
+    """Load the Kraken model at startup. Skips if model file is not present."""
+    global _model
+
+    if not os.path.exists(_model_path):
+        logger.warning("Kraken model not found at %s — Kurrent OCR will not be available", _model_path)
+        return
+
+    logger.info("Loading Kraken model from %s...", _model_path)
+
+    from kraken.lib import models as kraken_models
+    _model = kraken_models.load_any(_model_path)
+
+    logger.info("Kraken model loaded successfully")
+
+
+def is_available() -> bool:
+    return _model is not None
+
+
+def extract_page_blocks(image, page_idx: int, language: str = "de") -> list[dict]:
+    """Run Kraken segmentation + recognition on a single PIL image.
+
+    Returns block dicts for that page. Coordinates are normalized to [0, 1].
+    """
+    from kraken import blla, rpred
+    from confidence import words_from_characters
+
+    if _model is None:
+        raise RuntimeError("Kraken model is not loaded")
+
+    page_w, page_h = image.size
+    blocks = []
+
+    baseline_seg = blla.segment(image)
+    pred_it = rpred.rpred(_model, image, baseline_seg)
+
+    for record in pred_it:
+        polygon_pts = record.cuts if hasattr(record, "cuts") else []
+
+        if polygon_pts:
+            xs = [p[0] for p in polygon_pts]
+            ys = [p[1] for p in polygon_pts]
+            x1, y1 = min(xs), min(ys)
+            x2, y2 = max(xs), max(ys)
+        else:
+            xs = [p[0] for p in record.line]
+            ys = [p[1] for p in record.line]
+            x1, y1 = min(xs), min(ys) - 5
+            x2, y2 = max(xs), max(ys) + 5
+
+        quad = _approximate_to_quad(polygon_pts, page_w, page_h) if polygon_pts else None
+
+        char_confidences = getattr(record, "confidences", [])
+        words = words_from_characters(record.prediction, char_confidences)
+
+        blocks.append({
+            "pageNumber": page_idx,
+            "x": x1 / page_w,
+            "y": y1 / page_h,
+            "width": (x2 - x1) / page_w,
+            "height": (y2 - y1) / page_h,
+            "polygon": quad,
+            "text": record.prediction,
+            "words": words,
+        })
+
+    return blocks
+
+
+def extract_blocks(images: list, language: str = "de") -> list[dict]:
+    """Run Kraken segmentation + recognition on a list of PIL images.
+
+    Returns block dicts with pageNumber, x, y, width, height, polygon, text.
+    Polygon is a 4-point quadrilateral approximation of the baseline polygon.
+    Coordinates are normalized to [0, 1].
+    """
+    all_blocks = []
+
+    for page_idx, image in enumerate(images, start=1):
+        all_blocks.extend(extract_page_blocks(image, page_idx, language))
+
+    return all_blocks
+
+
+def _approximate_to_quad(points: list[tuple], page_w: float, page_h: float) -> list[list[float]] | None:
+    """Approximate a polygon to a 4-point quadrilateral using the minimum bounding rectangle.
+
+    Uses gift-wrapping (Jarvis march) for convex hull, then rotating calipers
+    for the minimum area bounding rectangle. Pure Python, no scipy/numpy.
+    """
+    if len(points) < 3:
+        return None
+
+    try:
+        hull = _convex_hull(points)
+        if len(hull) < 3:
+            return None
+
+        rect = _min_bounding_rect(hull)
+
+        # Normalize to [0, 1]
+        return [[p[0] / page_w, p[1] / page_h] for p in rect]
+    except Exception:
+        logger.debug("Failed to approximate polygon to quad, returning None")
+        return None
+
+
+def _convex_hull(points: list[tuple]) -> list[tuple]:
+    """Jarvis march (gift wrapping) algorithm for 2D convex hull."""
+    pts = list(set(points))
+    if len(pts) < 3:
+        return pts
+
+    # Start from leftmost point
+    start = min(pts, key=lambda p: (p[0], p[1]))
+    hull = []
+    current = start
+
+    while True:
+        hull.append(current)
+        candidate = pts[0]
+        for p in pts[1:]:
+            if candidate == current:
+                candidate = p
+                continue
+            cross = _cross(current, candidate, p)
+            if cross < 0:
+                candidate = p
+            elif cross == 0:
+                # Collinear — pick the farther point
+                if _dist_sq(current, p) > _dist_sq(current, candidate):
+                    candidate = p
+
+        current = candidate
+        if current == start:
+            break
+
+    return hull
+
+
+def _min_bounding_rect(hull: list[tuple]) -> list[tuple]:
+    """Find the minimum area bounding rectangle of a convex hull using rotating calipers."""
+    n = len(hull)
+    if n < 2:
+        return hull
+
+    min_area = float("inf")
+    best_rect = None
+
+    for i in range(n):
+        # Edge vector
+        edge_x = hull[(i + 1) % n][0] - hull[i][0]
+        edge_y = hull[(i + 1) % n][1] - hull[i][1]
+        edge_len = (edge_x ** 2 + edge_y ** 2) ** 0.5
+        if edge_len == 0:
+            continue
+
+        # Unit vectors along and perpendicular to the edge
+        ux, uy = edge_x / edge_len, edge_y / edge_len
+        vx, vy = -uy, ux
+
+        # Project all hull points onto the edge coordinate system
+        projs_u = [p[0] * ux + p[1] * uy for p in hull]
+        projs_v = [p[0] * vx + p[1] * vy for p in hull]
+
+        min_u, max_u = min(projs_u), max(projs_u)
+        min_v, max_v = min(projs_v), max(projs_v)
+
+        area = (max_u - min_u) * (max_v - min_v)
+        if area < min_area:
+            min_area = area
+            # Reconstruct 4 corners in original coordinates
+            best_rect = [
+                (min_u * ux + min_v * vx, min_u * uy + min_v * vy),
+                (max_u * ux + min_v * vx, max_u * uy + min_v * vy),
+                (max_u * ux + max_v * vx, max_u * uy + max_v * vy),
+                (min_u * ux + max_v * vx, min_u * uy + max_v * vy),
+            ]
+
+    return best_rect if best_rect else hull[:4]
+
+
+def _cross(o: tuple, a: tuple, b: tuple) -> float:
+    return (a[0] - o[0]) * (b[1] - o[1]) - (a[1] - o[1]) * (b[0] - o[0])
+
+
+def _dist_sq(a: tuple, b: tuple) -> float:
+    return (a[0] - b[0]) ** 2 + (a[1] - b[1]) ** 2

ocr-service/engines/surya.py

@@ -0,0 +1,97 @@
+"""Surya OCR engine wrapper — transformer-based, handles typewritten and modern Latin handwriting."""
+
+import logging
+
+logger = logging.getLogger(__name__)
+
+_recognition_predictor = None
+_detection_predictor = None
+_loaded = False
+
+
+def load_models():
+    """Lazy-load Surya models on first use to save RAM at idle.
+
+    Called automatically by extract_blocks(). Can also be called explicitly
+    to pre-warm if desired.
+    """
+    global _recognition_predictor, _detection_predictor, _loaded
+    if _loaded:
+        return
+
+    logger.info("Loading Surya models (lazy, first OCR request)...")
+
+    from surya.foundation import FoundationPredictor
+    from surya.recognition import RecognitionPredictor
+    from surya.detection import DetectionPredictor
+
+    foundation_predictor = FoundationPredictor()
+    _recognition_predictor = RecognitionPredictor(foundation_predictor)
+    _detection_predictor = DetectionPredictor()
+    _loaded = True
+
+    logger.info("Surya models loaded successfully")
+
+
+def extract_page_blocks(image, page_idx: int, language: str = "de") -> list[dict]:
+    """Run Surya OCR on a single PIL image and return block dicts for that page.
+
+    Coordinates are normalized to [0, 1].
+    """
+    load_models()
+
+    page_w, page_h = image.size
+    blocks = []
+
+    predictions = _recognition_predictor([image], det_predictor=_detection_predictor)
+    page_pred = predictions[0]
+
+    for line in page_pred.text_lines:
+        bbox = line.bbox
+        x1, y1, x2, y2 = bbox
+
+        polygon = None
+        if hasattr(line, "polygon") and line.polygon and len(line.polygon) == 4:
+            polygon = [
+                [p[0] / page_w, p[1] / page_h]
+                for p in line.polygon
+            ]
+
+        words = []
+        if hasattr(line, "words") and line.words:
+            for word in line.words:
+                words.append({
+                    "text": word.text,
+                    "confidence": word.confidence,
+                })
+        else:
+            words = [{"text": line.text, "confidence": getattr(line, "confidence", 1.0)}]
+
+        blocks.append({
+            "pageNumber": page_idx,
+            "x": x1 / page_w,
+            "y": y1 / page_h,
+            "width": (x2 - x1) / page_w,
+            "height": (y2 - y1) / page_h,
+            "polygon": polygon,
+            "text": line.text,
+            "words": words,
+        })
+
+    return blocks
+
+
+def extract_blocks(images: list, language: str = "de") -> list[dict]:
+    """Run Surya OCR on a list of PIL images (one per page).
+
+    Processes one page at a time to limit peak memory usage.
+    Returns a flat list of block dicts with pageNumber, x, y, width, height,
+    polygon, text, words. Coordinates are normalized to [0, 1].
+    """
+    all_blocks = []
+
+    for page_idx, image in enumerate(images, start=1):
+        all_blocks.extend(extract_page_blocks(image, page_idx, language))
+        del image
+
+    return all_blocks

ocr-service/main.py

@@ -0,0 +1,192 @@
+"""OCR microservice — FastAPI app with Surya and Kraken engine support."""
+
+import asyncio
+import io
+import json
+import logging
+import os
+from contextlib import asynccontextmanager
+from urllib.parse import urlparse
+
+import httpx
+import pypdfium2 as pdfium
+from fastapi import FastAPI, HTTPException
+from fastapi.responses import StreamingResponse
+from PIL import Image
+
+from confidence import apply_confidence_markers, get_threshold
+from engines import kraken as kraken_engine
+from engines import surya as surya_engine
+from models import OcrBlock, OcrRequest
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+_models_ready = False
+
+ALLOWED_PDF_HOSTS = set(
+    h.strip() for h in os.getenv("ALLOWED_PDF_HOSTS", "minio,localhost,127.0.0.1").split(",")
+)
+
+
+def _validate_url(url: str) -> None:
+    """Validate that the PDF URL points to an allowed host (SSRF protection)."""
+    parsed = urlparse(url)
+    hostname = parsed.hostname or ""
+    if hostname not in ALLOWED_PDF_HOSTS:
+        raise HTTPException(status_code=400, detail=f"PDF host not allowed: {hostname}")
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Load lightweight models at startup. Surya loads lazily on first request."""
+    global _models_ready
+
+    logger.info("Loading Kraken model at startup (Surya loads lazily on first OCR request)...")
+    kraken_engine.load_models()
+    _models_ready = True
+    logger.info("Startup complete — ready to accept requests")
+
+    yield
+
+    logger.info("Shutting down OCR service")
+
+
+app = FastAPI(title="Familienarchiv OCR Service", lifespan=lifespan)
+
+
+@app.get("/health")
+def health():
+    """Health endpoint — returns 200 only after models are loaded."""
+    if not _models_ready:
+        raise HTTPException(status_code=503, detail="Models not loaded yet")
+    return {"status": "ok", "surya": True, "kraken": kraken_engine.is_available()}
+
+
+@app.post("/ocr", response_model=list[OcrBlock])
+async def run_ocr(request: OcrRequest):
+    """Run OCR on a PDF document.
+
+    Downloads the PDF from the provided URL, converts pages to images,
+    and runs the appropriate OCR engine based on scriptType.
+    OCR engines run in a thread pool so the event loop stays free for /health.
+    """
+    if not _models_ready:
+        raise HTTPException(status_code=503, detail="Models not loaded yet")
+
+    images = await _download_and_convert_pdf(request.pdfUrl)
+
+    script_type = request.scriptType.upper()
+
+    if script_type == "HANDWRITING_KURRENT":
+        if not kraken_engine.is_available():
+            raise HTTPException(
+                status_code=400,
+                detail="Kraken model not available — cannot process Kurrent script",
+            )
+        blocks = await asyncio.to_thread(kraken_engine.extract_blocks, images, request.language)
+    else:
+        # TYPEWRITER, HANDWRITING_LATIN, UNKNOWN — all use Surya
+        blocks = await asyncio.to_thread(surya_engine.extract_blocks, images, request.language)
+
+    threshold = get_threshold(script_type)
+    for block in blocks:
+        if block.get("words"):
+            block["text"] = apply_confidence_markers(block["words"], threshold)
+        block.pop("words", None)
+
+    return [OcrBlock(**b) for b in blocks]
+
+
+@app.post("/ocr/stream")
+async def run_ocr_stream(request: OcrRequest):
+    """Run OCR on a PDF with NDJSON streaming — one JSON line per completed page."""
+    if not _models_ready:
+        raise HTTPException(status_code=503, detail="Models not loaded yet")
+
+    images = await _download_and_convert_pdf(request.pdfUrl)
+    script_type = request.scriptType.upper()
+    threshold = get_threshold(script_type)
+
+    use_kraken = script_type == "HANDWRITING_KURRENT"
+    if use_kraken and not kraken_engine.is_available():
+        raise HTTPException(
+            status_code=400,
+            detail="Kraken model not available — cannot process Kurrent script",
+        )
+
+    async def generate():
+        total_pages = len(images)
+        yield json.dumps({"type": "start", "totalPages": total_pages}) + "\n"
+
+        total_blocks = 0
+        skipped_pages = 0
+
+        for page_idx, image in enumerate(images, start=1):
+            try:
+                engine = kraken_engine if use_kraken else surya_engine
+                blocks = await asyncio.to_thread(
+                    engine.extract_page_blocks, image, page_idx, request.language
+                )
+
+                for block in blocks:
+                    if block.get("words"):
+                        block["text"] = apply_confidence_markers(block["words"], threshold)
+                    block.pop("words", None)
+
+                total_blocks += len(blocks)
+                yield json.dumps({
+                    "type": "page",
+                    "pageNumber": page_idx,
+                    "blocks": blocks,
+                }) + "\n"
+
+            except Exception:
+                logger.exception("OCR failed on page %d", page_idx)
+                skipped_pages += 1
+                yield json.dumps({
+                    "type": "error",
+                    "pageNumber": page_idx,
+                    "message": f"OCR processing failed on page {page_idx}",
+                }) + "\n"
+
+            finally:
+                del image
+
+        yield json.dumps({
+            "type": "done",
+            "totalBlocks": total_blocks,
+            "skippedPages": skipped_pages,
+        }) + "\n"
+
+    return StreamingResponse(
+        generate(),
+        media_type="application/x-ndjson",
+        headers={
+            "X-Accel-Buffering": "no",
+            "Cache-Control": "no-cache",
+        },
+    )
+
+
+async def _download_and_convert_pdf(url: str) -> list[Image.Image]:
+    """Download a PDF from a presigned URL and convert each page to a PIL Image."""
+    _validate_url(url)
+    async with httpx.AsyncClient(
+        timeout=httpx.Timeout(300.0), follow_redirects=False
+    ) as client:
+        response = await client.get(url)
+        response.raise_for_status()
+
+    pdf = pdfium.PdfDocument(io.BytesIO(response.content))
+    images = []
+
+    for page_idx in range(len(pdf)):
+        page = pdf[page_idx]
+        # Render at 200 DPI — balances OCR quality vs memory usage
+        # (Surya 0.17 models use ~5GB idle; 300 DPI causes OOM on multi-page docs)
+        bitmap = page.render(scale=200 / 72)
+        pil_image = bitmap.to_pil()
+        images.append(pil_image)
+
+    return images

ocr-service/models.py

@@ -0,0 +1,21 @@
+from pydantic import BaseModel, ConfigDict
+
+
+class OcrRequest(BaseModel):
+    model_config = ConfigDict(populate_by_name=True)
+
+    pdfUrl: str
+    scriptType: str = "UNKNOWN"
+    language: str = "de"
+
+
+class OcrBlock(BaseModel):
+    model_config = ConfigDict(populate_by_name=True)
+
+    pageNumber: int
+    x: float
+    y: float
+    width: float
+    height: float
+    polygon: list[list[float]] | None = None
+    text: str

ocr-service/requirements.txt

@@ -0,0 +1,10 @@
+fastapi[standard]==0.115.6
+surya-ocr==0.17.1
+kraken==7.0
+torch==2.7.1
+torchvision==0.22.1
+transformers>=4.56.1,<5.0.0
+pillow>=10.2.0,<11.0.0
+pypdfium2==4.30.0
+pyvips>=2.2.0
+httpx==0.28.1

ocr-service/test_confidence.py

@@ -0,0 +1,160 @@
+"""Tests for confidence-based [unleserlich] marker insertion."""
+
+import os
+import pytest
+from confidence import apply_confidence_markers, words_from_characters, get_threshold
+
+
+# ─── apply_confidence_markers ─────────────────────────────────────────────────
+
+
+def test_all_words_above_threshold_passes_through():
+    words = [
+        {"text": "Lieber", "confidence": 0.95},
+        {"text": "Freund", "confidence": 0.88},
+    ]
+    assert apply_confidence_markers(words) == "Lieber Freund"
+
+
+def test_single_low_confidence_word_replaced():
+    words = [
+        {"text": "Lieber", "confidence": 0.95},
+        {"text": "xkqz", "confidence": 0.1},
+        {"text": "Freund", "confidence": 0.88},
+    ]
+    assert apply_confidence_markers(words) == "Lieber [unleserlich] Freund"
+
+
+def test_adjacent_low_confidence_words_collapsed():
+    words = [
+        {"text": "Lieber", "confidence": 0.95},
+        {"text": "xkqz", "confidence": 0.1},
+        {"text": "abc", "confidence": 0.05},
+        {"text": "yyy", "confidence": 0.2},
+        {"text": "Freund", "confidence": 0.88},
+    ]
+    assert apply_confidence_markers(words) == "Lieber [unleserlich] Freund"
+
+
+def test_mixed_high_low_each_group_gets_marker():
+    words = [
+        {"text": "Lieber", "confidence": 0.95},
+        {"text": "xkqz", "confidence": 0.1},
+        {"text": "wie", "confidence": 0.9},
+        {"text": "abc", "confidence": 0.05},
+        {"text": "dir", "confidence": 0.88},
+    ]
+    assert apply_confidence_markers(words) == "Lieber [unleserlich] wie [unleserlich] dir"
+
+
+def test_all_below_threshold_returns_single_marker():
+    words = [
+        {"text": "xkq", "confidence": 0.1},
+        {"text": "zzz", "confidence": 0.05},
+    ]
+    assert apply_confidence_markers(words) == "[unleserlich]"
+
+
+def test_empty_list_returns_empty_string():
+    assert apply_confidence_markers([]) == ""
+
+
+def test_single_word_above_threshold():
+    words = [{"text": "Hallo", "confidence": 0.9}]
+    assert apply_confidence_markers(words) == "Hallo"
+
+
+def test_exact_threshold_passes_through():
+    """Confidence exactly at threshold should NOT be replaced (strict <)."""
+    words = [{"text": "Wort", "confidence": 0.3}]
+    assert apply_confidence_markers(words) == "Wort"
+
+
+def test_just_below_threshold_replaced():
+    words = [{"text": "Wort", "confidence": 0.29}]
+    assert apply_confidence_markers(words) == "[unleserlich]"
+
+
+def test_custom_threshold_via_parameter():
+    words = [
+        {"text": "Lieber", "confidence": 0.95},
+        {"text": "Freund", "confidence": 0.5},
+    ]
+    assert apply_confidence_markers(words, threshold=0.8) == "Lieber [unleserlich]"
+    assert apply_confidence_markers(words, threshold=0.3) == "Lieber Freund"
+
+
+def test_kurrent_threshold_is_higher_than_default():
+    default = get_threshold("TYPEWRITER")
+    kurrent = get_threshold("HANDWRITING_KURRENT")
+    assert kurrent > default
+
+
+def test_get_threshold_kurrent():
+    assert get_threshold("HANDWRITING_KURRENT") == 0.5
+
+
+def test_get_threshold_default():
+    assert get_threshold("TYPEWRITER") == 0.3
+    assert get_threshold("HANDWRITING_LATIN") == 0.3
+    assert get_threshold("UNKNOWN") == 0.3
+
+
+def test_low_confidence_at_start():
+    words = [
+        {"text": "xkq", "confidence": 0.1},
+        {"text": "Freund", "confidence": 0.88},
+    ]
+    assert apply_confidence_markers(words) == "[unleserlich] Freund"
+
+
+def test_low_confidence_at_end():
+    words = [
+        {"text": "Lieber", "confidence": 0.95},
+        {"text": "xkq", "confidence": 0.1},
+    ]
+    assert apply_confidence_markers(words) == "Lieber [unleserlich]"
+
+
+# ─── words_from_characters ────────────────────────────────────────────────────
+
+
+def test_single_word_matching_confidences():
+    words = words_from_characters("Hallo", [0.9, 0.8, 0.85, 0.7, 0.95])
+    assert len(words) == 1
+    assert words[0]["text"] == "Hallo"
+    assert abs(words[0]["confidence"] - 0.84) < 0.01
+
+
+def test_multi_word_with_spaces():
+    prediction = "Sehr geehrter"
+    confidences = [0.9, 0.8, 0.7, 0.6, 0.5, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2]
+    words = words_from_characters(prediction, confidences)
+    assert len(words) == 2
+    assert words[0]["text"] == "Sehr"
+    assert words[1]["text"] == "geehrter"
+
+
+def test_length_mismatch_falls_back_safely():
+    words = words_from_characters("Hallo Welt", [0.9, 0.8])
+    assert len(words) == 1
+    assert words[0]["text"] == "Hallo Welt"
+    assert words[0]["confidence"] == 1.0
+
+
+def test_empty_prediction_returns_empty():
+    assert words_from_characters("", []) == []
+
+
+def test_single_character_word():
+    words = words_from_characters("A B", [0.9, 0.5, 0.3])
+    assert len(words) == 2
+    assert words[0]["text"] == "A"
+    assert words[0]["confidence"] == 0.9
+    assert words[1]["text"] == "B"
+    assert words[1]["confidence"] == 0.3
+
+
+def test_whitespace_only_prediction():
+    words = words_from_characters("   ", [0.5, 0.5, 0.5])
+    assert words == []

ocr-service/test_engines.py

@@ -0,0 +1,178 @@
+"""Tests for per-page block extraction in OCR engines."""
+
+from unittest.mock import MagicMock, patch
+from PIL import Image
+
+from engines import surya, kraken
+
+
+# ─── Surya extract_page_blocks ───────────────────────────────────────────────
+
+
+def _make_surya_line(text, bbox, polygon=None, words=None):
+    """Create a mock Surya text line with the expected attributes."""
+    line = MagicMock()
+    line.text = text
+    line.bbox = bbox
+    line.polygon = polygon
+    line.words = words or []
+    if not words:
+        line.confidence = 0.95
+        # hasattr check needs words to be falsy
+        del line.words
+    return line
+
+
+def test_surya_extract_page_blocks_returns_blocks_for_single_image():
+    image = Image.new("RGB", (100, 200))
+
+    mock_line = _make_surya_line("Hallo Welt", [10, 20, 90, 40])
+    mock_pred = MagicMock()
+    mock_pred.text_lines = [mock_line]
+
+    with patch.object(surya, "_recognition_predictor") as mock_rec, \
+         patch.object(surya, "_loaded", True):
+        mock_rec.return_value = [mock_pred]
+
+        blocks = surya.extract_page_blocks(image, page_idx=2, language="de")
+
+    assert len(blocks) == 1
+    assert blocks[0]["pageNumber"] == 2
+    assert blocks[0]["text"] == "Hallo Welt"
+    assert blocks[0]["x"] == 10 / 100
+    assert blocks[0]["y"] == 20 / 200
+    assert blocks[0]["width"] == 80 / 100
+    assert blocks[0]["height"] == 20 / 200
+
+
+def test_surya_extract_page_blocks_extracts_polygon_when_present():
+    image = Image.new("RGB", (100, 200))
+
+    mock_line = _make_surya_line("Text", [10, 20, 90, 40])
+    mock_line.polygon = [(10, 20), (90, 20), (90, 40), (10, 40)]
+
+    mock_pred = MagicMock()
+    mock_pred.text_lines = [mock_line]
+
+    with patch.object(surya, "_recognition_predictor") as mock_rec, \
+         patch.object(surya, "_loaded", True):
+        mock_rec.return_value = [mock_pred]
+
+        blocks = surya.extract_page_blocks(image, page_idx=1, language="de")
+
+    assert blocks[0]["polygon"] is not None
+    assert len(blocks[0]["polygon"]) == 4
+    assert blocks[0]["polygon"][0] == [10 / 100, 20 / 200]
+
+
+def test_surya_extract_page_blocks_extracts_word_level_confidence():
+    image = Image.new("RGB", (100, 200))
+
+    word1 = MagicMock()
+    word1.text = "Hallo"
+    word1.confidence = 0.95
+    word2 = MagicMock()
+    word2.text = "Welt"
+    word2.confidence = 0.3
+
+    mock_line = _make_surya_line("Hallo Welt", [10, 20, 90, 40], words=[word1, word2])
+
+    mock_pred = MagicMock()
+    mock_pred.text_lines = [mock_line]
+
+    with patch.object(surya, "_recognition_predictor") as mock_rec, \
+         patch.object(surya, "_loaded", True):
+        mock_rec.return_value = [mock_pred]
+
+        blocks = surya.extract_page_blocks(image, page_idx=1, language="de")
+
+    assert len(blocks[0]["words"]) == 2
+    assert blocks[0]["words"][0]["text"] == "Hallo"
+    assert blocks[0]["words"][0]["confidence"] == 0.95
+
+
+def test_surya_extract_blocks_delegates_to_extract_page_blocks():
+    """After refactoring, extract_blocks should produce the same output."""
+    image1 = Image.new("RGB", (100, 200))
+    image2 = Image.new("RGB", (100, 200))
+
+    mock_line = _make_surya_line("Test", [10, 20, 90, 40])
+    mock_pred = MagicMock()
+    mock_pred.text_lines = [mock_line]
+
+    with patch.object(surya, "_recognition_predictor") as mock_rec, \
+         patch.object(surya, "_loaded", True):
+        mock_rec.return_value = [mock_pred]
+
+        blocks = surya.extract_blocks([image1, image2])
+
+    assert len(blocks) == 2
+    assert blocks[0]["pageNumber"] == 1
+    assert blocks[1]["pageNumber"] == 2
+
+
+# ─── Kraken extract_page_blocks ──────────────────────────────────────────────
+
+
+def _make_kraken_record(text, cuts, confidences=None):
+    record = MagicMock()
+    record.prediction = text
+    record.cuts = cuts
+    record.line = cuts
+    record.confidences = confidences or [0.9] * len(text)
+    return record
+
+
+def _run_kraken_with_mocks(fn, *args):
+    """Run a kraken function with blla/rpred mocked via sys.modules."""
+    import sys
+    mock_blla = MagicMock()
+    mock_blla.segment.return_value = MagicMock()
+    mock_rpred = MagicMock()
+
+    mock_record = _make_kraken_record("Kurrent", [(10, 20), (90, 20), (90, 40), (10, 40)])
+    mock_rpred.rpred.return_value = [mock_record]
+
+    saved_kraken = sys.modules.get("kraken")
+    saved_blla = sys.modules.get("kraken.blla")
+    saved_rpred = sys.modules.get("kraken.rpred")
+
+    sys.modules["kraken"] = MagicMock(blla=mock_blla, rpred=mock_rpred)
+    sys.modules["kraken.blla"] = mock_blla
+    sys.modules["kraken.rpred"] = mock_rpred
+
+    try:
+        with patch.object(kraken, "_model", MagicMock()):
+            return fn(*args)
+    finally:
+        if saved_kraken is not None:
+            sys.modules["kraken"] = saved_kraken
+        else:
+            sys.modules.pop("kraken", None)
+        if saved_blla is not None:
+            sys.modules["kraken.blla"] = saved_blla
+        else:
+            sys.modules.pop("kraken.blla", None)
+        if saved_rpred is not None:
+            sys.modules["kraken.rpred"] = saved_rpred
+        else:
+            sys.modules.pop("kraken.rpred", None)
+
+
+def test_kraken_extract_page_blocks_returns_blocks_for_single_image():
+    image = Image.new("RGB", (100, 200))
+    blocks = _run_kraken_with_mocks(kraken.extract_page_blocks, image, 3, "de")
+
+    assert len(blocks) == 1
+    assert blocks[0]["pageNumber"] == 3
+    assert blocks[0]["text"] == "Kurrent"
+
+
+def test_kraken_extract_blocks_delegates_to_extract_page_blocks():
+    image1 = Image.new("RGB", (100, 200))
+    image2 = Image.new("RGB", (100, 200))
+    blocks = _run_kraken_with_mocks(kraken.extract_blocks, [image1, image2])
+
+    assert len(blocks) == 2
+    assert blocks[0]["pageNumber"] == 1
+    assert blocks[1]["pageNumber"] == 2

ocr-service/test_stream.py

@@ -0,0 +1,303 @@
+"""Tests for the NDJSON streaming OCR endpoint POST /ocr/stream."""
+
+import json
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+from httpx import ASGITransport, AsyncClient
+
+from main import app
+
+
+@pytest.fixture
+def mock_images():
+    """Return 3 fake PIL images."""
+    from PIL import Image
+    return [Image.new("RGB", (100, 200)) for _ in range(3)]
+
+
+def _make_block(page_idx, text="Test"):
+    return {
+        "pageNumber": page_idx,
+        "x": 0.1, "y": 0.2, "width": 0.8, "height": 0.1,
+        "polygon": None, "text": text,
+        "words": [{"text": text, "confidence": 0.95}],
+    }
+
+
+# ─── P3: start event with total pages ────────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_emits_start_event_with_total_pages(mock_images):
+    with patch("main._download_and_convert_pdf", new_callable=AsyncMock, return_value=mock_images), \
+         patch("main._models_ready", True), \
+         patch("main.surya_engine") as mock_surya:
+        mock_surya.extract_page_blocks.return_value = [_make_block(0)]
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "TYPEWRITER",
+                "language": "de",
+            })
+
+        lines = [json.loads(line) for line in response.text.strip().split("\n") if line.strip()]
+        assert lines[0] == {"type": "start", "totalPages": 3}
+
+
+# ─── P4: page events per completed page ──────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_emits_page_event_per_page_with_blocks(mock_images):
+    def page_blocks(image, page_idx, language="de"):
+        return [_make_block(page_idx, f"Page {page_idx}")]
+
+    with patch("main._download_and_convert_pdf", new_callable=AsyncMock, return_value=mock_images), \
+         patch("main._models_ready", True), \
+         patch("main.surya_engine") as mock_surya:
+        mock_surya.extract_page_blocks.side_effect = page_blocks
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "TYPEWRITER",
+            })
+
+        lines = [json.loads(line) for line in response.text.strip().split("\n") if line.strip()]
+        page_events = [l for l in lines if l["type"] == "page"]
+        assert len(page_events) == 3
+        assert page_events[0]["pageNumber"] == 1
+        assert page_events[1]["pageNumber"] == 2
+        assert page_events[2]["pageNumber"] == 3
+        assert len(page_events[0]["blocks"]) == 1
+
+
+# ─── P5: done event with total blocks and skipped ────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_emits_done_with_total_blocks(mock_images):
+    def page_blocks(image, page_idx, language="de"):
+        return [_make_block(page_idx)] * 2  # 2 blocks per page
+
+    with patch("main._download_and_convert_pdf", new_callable=AsyncMock, return_value=mock_images), \
+         patch("main._models_ready", True), \
+         patch("main.surya_engine") as mock_surya:
+        mock_surya.extract_page_blocks.side_effect = page_blocks
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "TYPEWRITER",
+            })
+
+        lines = [json.loads(line) for line in response.text.strip().split("\n") if line.strip()]
+        done = [l for l in lines if l["type"] == "done"][0]
+        assert done["totalBlocks"] == 6
+        assert done["skippedPages"] == 0
+
+
+# ─── P6: error event on page failure, continues ──────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_emits_error_event_on_page_failure_and_continues(mock_images):
+    call_count = 0
+
+    def page_blocks(image, page_idx, language="de"):
+        nonlocal call_count
+        call_count += 1
+        if page_idx == 2:
+            raise RuntimeError("Engine crashed on page 2")
+        return [_make_block(page_idx)]
+
+    with patch("main._download_and_convert_pdf", new_callable=AsyncMock, return_value=mock_images), \
+         patch("main._models_ready", True), \
+         patch("main.surya_engine") as mock_surya:
+        mock_surya.extract_page_blocks.side_effect = page_blocks
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "TYPEWRITER",
+            })
+
+        lines = [json.loads(line) for line in response.text.strip().split("\n") if line.strip()]
+        types = [l["type"] for l in lines]
+        assert "error" in types
+        error_event = [l for l in lines if l["type"] == "error"][0]
+        assert error_event["pageNumber"] == 2
+        # Error message must be generic, not the raw traceback
+        assert "Engine crashed" not in error_event["message"]
+
+        # Processing continued: pages 0 and 2 have page events
+        page_events = [l for l in lines if l["type"] == "page"]
+        assert len(page_events) == 2
+
+        done = [l for l in lines if l["type"] == "done"][0]
+        assert done["skippedPages"] == 1
+
+
+# ─── P7: old /ocr endpoint still works ───────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_old_ocr_endpoint_still_returns_flat_list(mock_images):
+    with patch("main._download_and_convert_pdf", new_callable=AsyncMock, return_value=mock_images), \
+         patch("main._models_ready", True), \
+         patch("main.surya_engine") as mock_surya:
+        mock_surya.extract_blocks.return_value = [_make_block(1), _make_block(2)]
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "TYPEWRITER",
+            })
+
+        assert response.status_code == 200
+        data = response.json()
+        assert isinstance(data, list)
+        assert len(data) == 2
+        assert data[0]["pageNumber"] == 1
+
+
+# ─── Health and error handling ────────────────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_health_returns_ok_when_models_ready():
+    with patch("main._models_ready", True), \
+         patch("main.kraken_engine") as mock_kraken:
+        mock_kraken.is_available.return_value = True
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.get("/health")
+
+        assert response.status_code == 200
+        data = response.json()
+        assert data["status"] == "ok"
+        assert data["surya"] is True
+        assert data["kraken"] is True
+
+
+@pytest.mark.asyncio
+async def test_health_returns_503_when_models_not_ready():
+    with patch("main._models_ready", False):
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.get("/health")
+
+        assert response.status_code == 503
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_returns_503_when_models_not_ready():
+    with patch("main._models_ready", False):
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "TYPEWRITER",
+            })
+
+        assert response.status_code == 503
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_uses_kraken_for_kurrent_script(mock_images):
+    with patch("main._download_and_convert_pdf", new_callable=AsyncMock, return_value=mock_images), \
+         patch("main._models_ready", True), \
+         patch("main.kraken_engine") as mock_kraken:
+        mock_kraken.is_available.return_value = True
+        mock_kraken.extract_page_blocks.return_value = [_make_block(1, "Kurrent text")]
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "HANDWRITING_KURRENT",
+            })
+
+        lines = [json.loads(line) for line in response.text.strip().split("\n") if line.strip()]
+        page_events = [l for l in lines if l["type"] == "page"]
+        assert len(page_events) == 3
+        mock_kraken.extract_page_blocks.assert_called()
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_returns_400_when_kraken_unavailable_for_kurrent(mock_images):
+    with patch("main._download_and_convert_pdf", new_callable=AsyncMock, return_value=mock_images), \
+         patch("main._models_ready", True), \
+         patch("main.kraken_engine") as mock_kraken:
+        mock_kraken.is_available.return_value = False
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "HANDWRITING_KURRENT",
+            })
+
+        assert response.status_code == 400
+
+
+# ─── SSRF protection ─────────────────────────────────────────────────────────
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_rejects_disallowed_host():
+    with patch("main._models_ready", True):
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://evil.example.com/malicious.pdf",
+                "scriptType": "TYPEWRITER",
+            })
+
+    assert response.status_code == 400
+    assert "not allowed" in response.json()["detail"]
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_allows_minio_host(mock_images):
+    with patch("main._download_and_convert_pdf", new_callable=AsyncMock, return_value=mock_images), \
+         patch("main._models_ready", True), \
+         patch("main.surya_engine") as mock_surya:
+        mock_surya.extract_page_blocks.return_value = [_make_block(0)]
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "TYPEWRITER",
+            })
+
+    assert response.status_code == 200
+
+
+@pytest.mark.asyncio
+async def test_ocr_stream_applies_confidence_markers(mock_images):
+    """Low-confidence words should be replaced with [unleserlich] in the stream output."""
+    def page_blocks(image, page_idx, language="de"):
+        return [{
+            "pageNumber": page_idx,
+            "x": 0.1, "y": 0.2, "width": 0.8, "height": 0.1,
+            "polygon": None,
+            "text": "original text",
+            "words": [
+                {"text": "Lieber", "confidence": 0.95},
+                {"text": "xkqz", "confidence": 0.1},
+            ],
+        }]
+
+    with patch("main._download_and_convert_pdf", new_callable=AsyncMock, return_value=mock_images[:1]), \
+         patch("main._models_ready", True), \
+         patch("main.surya_engine") as mock_surya:
+        mock_surya.extract_page_blocks.side_effect = page_blocks
+
+        async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as client:
+            response = await client.post("/ocr/stream", json={
+                "pdfUrl": "http://minio/test.pdf",
+                "scriptType": "TYPEWRITER",
+            })
+
+    lines = [json.loads(line) for line in response.text.strip().split("\n") if line.strip()]
+    page = [l for l in lines if l["type"] == "page"][0]
+    assert page["blocks"][0]["text"] == "Lieber [unleserlich]"
+    assert "words" not in page["blocks"][0]

scripts/download-kraken-models.sh

@@ -0,0 +1,203 @@
+#!/bin/bash
+set -euo pipefail
+
+# Downloads Kraken HTR models, runs OCR evaluation on sample PDFs, and activates the winner.
+#
+# Usage:
+#   ./scripts/download-kraken-models.sh                # download models + run evaluation
+#   ./scripts/download-kraken-models.sh --activate 1   # activate model 1
+#   ./scripts/download-kraken-models.sh --activate 2   # activate model 2
+#   ./scripts/download-kraken-models.sh --eval-only    # re-run evaluation (models already downloaded)
+
+COMPOSE_SERVICE="ocr-service"
+MODEL_DIR="/app/models"
+ACTIVE_MODEL="$MODEL_DIR/german_kurrent.mlmodel"
+
+# Kraken 7 uses DOIs to identify models from HTR-United / Zenodo
+MODEL_1_DOI="10.5281/zenodo.7933463"
+MODEL_1_NAME="german_handwriting"
+MODEL_1_DESC="HTR model for German manuscripts (handwritten text recognition)"
+MODEL_1_PATH="$MODEL_DIR/$MODEL_1_NAME.mlmodel"
+
+MODEL_2_DOI="10.5281/zenodo.13788177"
+MODEL_2_NAME="mccatmus"
+MODEL_2_DESC="McCATMuS — generic model for handwritten, printed & typewritten (16th c. onward)"
+MODEL_2_PATH="$MODEL_DIR/$MODEL_2_NAME.mlmodel"
+
+EVAL_PDFS=("Eu-0693.pdf" "Eu-0692.pdf" "W-0150.pdf" "W-0575.pdf")
+IMPORT_DIR="./import"
+OUTPUT_BASE="./ocr-model-evaluation"
+
+# ─── Functions ────────────────────────────────────────────────────────────────
+
+download_model() {
+    local doi="$1"
+    local dest="$2"
+    local name="$3"
+
+    echo "  Downloading $name ($doi)..."
+
+    # kraken get downloads to /root/.local/share/htrmopo/<uuid>/<name>.mlmodel
+    # Parse the "Model dir: <path>" line from kraken output to locate the file
+    docker compose run --rm "$COMPOSE_SERVICE" sh -c '
+        OUTPUT=$(kraken get '"$doi"' 2>&1)
+        echo "$OUTPUT"
+        MODEL_DIR=$(echo "$OUTPUT" | grep -oP "Model dir: \K[^ ]+")
+        if [ -n "$MODEL_DIR" ] && [ -d "$MODEL_DIR" ]; then
+            FOUND=$(find "$MODEL_DIR" -name "*.mlmodel" | head -1)
+            if [ -n "$FOUND" ]; then
+                cp "$FOUND" '"$dest"'
+                echo "Saved to '"$dest"'"
+            else
+                echo "ERROR: No .mlmodel file in $MODEL_DIR"
+                ls -la "$MODEL_DIR"
+                exit 1
+            fi
+        else
+            echo "ERROR: Could not parse model directory from kraken output"
+            exit 1
+        fi
+    '
+}
+
+download_models() {
+    echo "Downloading Kraken HTR models into the ocr_models volume..."
+    echo ""
+
+    echo "Model 1: $MODEL_1_NAME"
+    echo "  $MODEL_1_DESC"
+    download_model "$MODEL_1_DOI" "$MODEL_1_PATH" "$MODEL_1_NAME"
+    echo ""
+
+    echo "Model 2: $MODEL_2_NAME"
+    echo "  $MODEL_2_DESC"
+    download_model "$MODEL_2_DOI" "$MODEL_2_PATH" "$MODEL_2_NAME"
+    echo ""
+
+    echo "Both models downloaded."
+}
+
+run_evaluation() {
+    echo ""
+    echo "═══════════════════════════════════════════════════════"
+    echo "  Running OCR evaluation on ${#EVAL_PDFS[@]} documents"
+    echo "═══════════════════════════════════════════════════════"
+    echo ""
+
+    local dir_1="$OUTPUT_BASE/$MODEL_1_NAME"
+    local dir_2="$OUTPUT_BASE/$MODEL_2_NAME"
+    mkdir -p "$dir_1" "$dir_2"
+
+    for pdf in "${EVAL_PDFS[@]}"; do
+        local src="$IMPORT_DIR/$pdf"
+        local basename="${pdf%.pdf}"
+
+        if [[ ! -f "$src" ]]; then
+            echo "SKIP: $src not found"
+            continue
+        fi
+
+        echo "──── $pdf ────"
+
+        # Run both models inside a single container run:
+        # 1. Extract PDF pages as PNGs (pypdfium2 is already installed)
+        # 2. Run kraken on each page image for both models
+        # 3. Concatenate per-page output into one file per model
+        docker compose run --rm \
+            -v "$(cd "$IMPORT_DIR" && pwd):/eval-input:ro" \
+            -v "$(cd "$dir_1" && pwd):/eval-out-1" \
+            -v "$(cd "$dir_2" && pwd):/eval-out-2" \
+            "$COMPOSE_SERVICE" \
+            python3 -c "
+import pypdfium2 as pdfium, subprocess, sys, os
+
+pdf = pdfium.PdfDocument('/eval-input/$pdf')
+pages = []
+for i in range(len(pdf)):
+    bmp = pdf[i].render(scale=300/72)
+    path = f'/tmp/page_{i:04d}.png'
+    bmp.to_pil().save(path)
+    pages.append(path)
+print(f'Extracted {len(pages)} pages')
+
+for label, model, outdir in [
+    ('Model 1', '$MODEL_1_PATH', '/eval-out-1'),
+    ('Model 2', '$MODEL_2_PATH', '/eval-out-2'),
+]:
+    print(f'  {label}...')
+    combined = ''
+    for p in pages:
+        args = ['kraken', '-i', p, '/dev/stdout', 'segment', '-bl', 'ocr', '-m', model]
+        r = subprocess.run(args, capture_output=True, text=True)
+        combined += r.stdout
+        if r.returncode != 0:
+            print(f'    ⚠ failed on {os.path.basename(p)}: {r.stderr[:200]}', file=sys.stderr)
+    with open(f'{outdir}/${basename}.txt', 'w') as f:
+        f.write(combined)
+    lines = combined.count(chr(10))
+    print(f'    → {lines} lines')
+" || echo "  ⚠ Failed on $pdf"
+
+        echo ""
+    done
+
+    echo "═══════════════════════════════════════════════════════"
+    echo "  Evaluation complete. Results:"
+    echo ""
+    echo "  Model 1 — $MODEL_1_NAME ($MODEL_1_DOI):"
+    for f in "$dir_1"/*.txt; do
+        [[ -f "$f" ]] && echo "    $(basename "$f"): $(wc -l < "$f") lines, $(wc -c < "$f") bytes"
+    done
+    echo ""
+    echo "  Model 2 — $MODEL_2_NAME ($MODEL_2_DOI):"
+    for f in "$dir_2"/*.txt; do
+        [[ -f "$f" ]] && echo "    $(basename "$f"): $(wc -l < "$f") lines, $(wc -c < "$f") bytes"
+    done
+    echo ""
+    echo "  Compare outputs:"
+    echo "    diff $dir_1/Eu-0693.txt $dir_2/Eu-0693.txt"
+    echo "    # or view individually:"
+    echo "    cat $dir_1/Eu-0693.txt"
+    echo ""
+    echo "  Activate the better model:"
+    echo "    ./scripts/download-kraken-models.sh --activate 1   # $MODEL_1_NAME"
+    echo "    ./scripts/download-kraken-models.sh --activate 2   # $MODEL_2_NAME"
+    echo "═══════════════════════════════════════════════════════"
+}
+
+activate_model() {
+    local choice="$1"
+    case "$choice" in
+        1)
+            echo "Activating model 1: $MODEL_1_NAME"
+            docker compose run --rm "$COMPOSE_SERVICE" cp "$MODEL_1_PATH" "$ACTIVE_MODEL"
+            ;;
+        2)
+            echo "Activating model 2: $MODEL_2_NAME"
+            docker compose run --rm "$COMPOSE_SERVICE" cp "$MODEL_2_PATH" "$ACTIVE_MODEL"
+            ;;
+        *)
+            echo "Error: --activate expects 1 or 2"
+            exit 1
+            ;;
+    esac
+
+    echo "Active model is now: $ACTIVE_MODEL"
+    echo "Restart the OCR service to load the new model:"
+    echo "  docker compose restart ocr-service"
+}
+
+# ─── Main ─────────────────────────────────────────────────────────────────────
+
+case "${1:-}" in
+    --activate)
+        activate_model "${2:-}"
+        ;;
+    --eval-only)
+        run_evaluation
+        ;;
+    *)
+        download_models
+        run_evaluation
+        ;;
+esac