Implement document reconciliation v2

migrations/007_document_reconciliation_v2_down.sql

@@ -0,0 +1,37 @@
+-- EXECUTE ONLY AFTER reverting application code and stopping every v2 consumer.
+-- Before running, export opportunity_document_link_events and set these session flags:
+--   SET clientflow.v2_consumers_active = 'off';
+--   SET clientflow.document_ledger_exported = 'on';
+BEGIN;
+
+DO $$
+BEGIN
+  IF current_setting('clientflow.v2_consumers_active', true) IS DISTINCT FROM 'off' THEN
+    RAISE EXCEPTION 'rollback refused: confirm all v2 consumers are stopped';
+  END IF;
+  IF current_setting('clientflow.document_ledger_exported', true) IS DISTINCT FROM 'on' THEN
+    RAISE EXCEPTION 'rollback refused: export the reconciliation ledger first';
+  END IF;
+  IF EXISTS (SELECT 1 FROM commercial_documents
+             WHERE opportunity_id IS NULL OR role IS NULL OR is_primary IS NULL OR is_active IS NULL) THEN
+    RAISE EXCEPTION 'rollback refused: legacy compatibility fields are incomplete';
+  END IF;
+END $$;
+
+-- Remove dependent line foreign keys/columns before their target tables.
+ALTER TABLE commercial_document_lines DROP CONSTRAINT IF EXISTS commercial_document_lines_opportunity_document_link_id_fkey;
+DROP INDEX IF EXISTS idx_document_lines_opportunity_link;
+ALTER TABLE commercial_document_lines DROP COLUMN IF EXISTS opportunity_document_link_id;
+ALTER TABLE commercial_document_lines DROP CONSTRAINT IF EXISTS ck_commercial_document_lines_document_present;
+ALTER TABLE commercial_document_lines DROP CONSTRAINT IF EXISTS commercial_document_lines_commercial_document_id_fkey;
+DROP INDEX IF EXISTS idx_document_lines_commercial_document;
+ALTER TABLE commercial_document_lines DROP COLUMN IF EXISTS commercial_document_id;
+
+DROP TRIGGER IF EXISTS trg_document_link_events_append_only ON opportunity_document_link_events;
+DROP FUNCTION IF EXISTS reject_document_link_event_mutation();
+DROP TABLE IF EXISTS opportunity_document_link_events;
+DROP TABLE IF EXISTS document_reconciliation_commands;
+DROP TABLE IF EXISTS opportunity_document_links;
+DELETE FROM schema_migrations WHERE version='007';
+
+COMMIT;