refactor(db): normalize module prefix snapshot rows

Строки префиксов в module_prefix_snapshot_row вместо JSONB blobs.

Co-authored-by: Cursor <[email protected]>

migrations/postgres/000019_module_snapshot_rows.down.sql

@@ -0,0 +1,16 @@
+ALTER TABLE module_prefix_snapshot ADD COLUMN prefixes_json JSONB NOT NULL DEFAULT '[]';
+
+UPDATE module_prefix_snapshot mps
+SET prefixes_json = COALESCE((
+    SELECT jsonb_agg(
+        jsonb_build_object(
+            'prefix', psr.prefix::text,
+            'community_id', psr.community_id,
+            'source', psr.source
+        ) ORDER BY psr.ord
+    )
+    FROM module_prefix_snapshot_row psr
+    WHERE psr.tenant_id = mps.tenant_id AND psr.module_id = mps.module_id
+), '[]'::jsonb);
+
+DROP TABLE IF EXISTS module_prefix_snapshot_row;