bootstrap ircs-prod gitops config

docs/data-migration-runbook.md

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+# ircs-system to ircs-prod compatible data migration
+
+Goal: migrate old `ircs-system` business data into V3 `ircs-prod` while allowing incompatible runtime tables to be discarded.
+
+Required order:
+
+1. Back up old `ircs-system` PostgreSQL.
+2. Prepare `ircs-prod` secrets with `scripts/prepare-prod-secrets.ps1`.
+3. Sync `ircs-prod-core` and wait for PostgreSQL, RabbitMQ, Valkey, Elasticsearch, services, and migrator.
+4. Run `scripts/migrate-compatible-data.ps1` once without `-Execute` to compare table presence.
+5. Run `scripts/migrate-compatible-data.ps1 -Execute -TruncateTarget` only when `ircs-prod` has no valuable data.
+6. Rebuild search/index derived state through V3 ops runners after migration.
+
+Migration policy:
+
+- Copy compatible V1 business tables only.
+- Do not copy `databasechangelog` or `databasechangeloglock`.
+- Do not copy V3 derived audit/outbox/maintenance tables.
+- If a table or column becomes incompatible, prefer explicit table-level skip plus a written note over silent lossy conversion.
+- Existing R2 bucket remains `ircs` so historical media URLs stay valid.