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08669bca21
Adds the one-off cutover migration that takes a pre-1321 single-community Postgres to the 1321 multi-tenant schema. Rather than hand-describe the target (which is how the earlier draft introduced single-tenant PKs on multi-tenant tables and dropped ~13 community_id FKs), 0002 renames the pre-1321 tables and enum types aside into a legacy schema, runs 1321's own 0001 verbatim into a clean public schema, copies every row forward stamped with a default community_id derived from the deployment host, then drops legacy. Runs in one transaction with an idempotency guard that refuses a non-pristine DB, so the migrated schema is identical to a fresh 1321 DB by construction. Verified end-to-end on a throwaway Postgres seeded with pre-1321 data: exit 0, zero NULL community_id, search_tsv regenerated, structural diff vs fresh-1321 all-empty (constraints/triggers/indexes/columns), relay boots with zero errors, and the previously boot-fatal allowlist->relay_members backfill succeeds. Desktop integration suite is 99/99 green against this script's output. See OUTBOX/1321_CUTOVER_RUNBOOK.md for the operator runbook (snapshot-is-rollback, required constraint-level diff gate, RELAY_URL + BUZZ_AUTO_MIGRATE=false caveats). Co-authored-by: Tyler Longwell <tlongwell@block.xyz> Signed-off-by: Tyler Longwell <tlongwell@block.xyz>