One-time data migration from khala_sync_prod #21

Outcome

All 1,391 posts and 230 topics are migrated from Cloud SQL khala_sync_prod into the application database with legacy ids preserved.

Work

• Mix task reading over the Cloud SQL Auth Proxy (or a dump), transforming rows into the new schema.
• Idempotent: re-running does not duplicate.
• Post-migration verification report comparing counts and sampled bodies.
• Decide and record the fate of the source database after cutover.

Acceptance criteria

• Counts match exactly; sampled bodies byte-identical after markdown normalization.
• Migration report checked into docs/evidence.

Verification

Dry-run against a staging copy of the source data.