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docs(deployment): add PgBouncer transaction-mode requirement for DEFERRABLE constraints
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The journey_items position_seq dedup constraint is DEFERRABLE INITIALLY DEFERRED,
which requires PgBouncer to run in transaction-mode pooling. Document this so
operators know not to switch to statement-level pooling.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Marcel
2026-06-12 13:36:17 +02:00
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docs/DEPLOYMENT.md
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@@ -124,6 +124,8 @@ All vars are set in `.env` at the repo root (copy from `.env.example`). The back
| `POSTGRES_PASSWORD` | DB password | `change-me` | YES | YES |
| `POSTGRES_DB` | Database name | `family_archive_db` | YES | — |
> **PgBouncer pooling mode:** The `journey_items.position_seq` dedup constraint uses `DEFERRABLE INITIALLY DEFERRED`. This requires PgBouncer in **transaction-mode** (not statement-mode) pooling. Do not switch to statement-level pooling — deferred constraints only work within a single transaction session.
### MinIO container
| Variable | Purpose | Default | Required? | Sensitive? |