improvement(tables): backfill default views for existing tables (#6899)

packages/db/migrations/0301_backfill_table_default_views.sql

@@ -0,0 +1,32 @@
+-- migration-safe: data-only backfill after table creation began seeding default views;
+-- empty config inherits legacy table metadata until each layout field is explicitly saved.
+-- Idempotent on replay and safe against concurrent default creation through the partial unique index.
+INSERT INTO "table_views" (
+	"id",
+	"table_id",
+	"workspace_id",
+	"name",
+	"config",
+	"is_default",
+	"created_by",
+	"created_at",
+	"updated_at"
+)
+SELECT
+	gen_random_uuid()::text,
+	t."id",
+	t."workspace_id",
+	'Default',
+	'{}'::jsonb,
+	true,
+	t."created_by",
+	t."created_at",
+	now()
+FROM "user_table_definitions" t
+WHERE NOT EXISTS (
+	SELECT 1
+	FROM "table_views" v
+	WHERE v."table_id" = t."id"
+		AND v."is_default" = true
+)
+ON CONFLICT ("table_id") WHERE "is_default" = true DO NOTHING;

packages/db/migrations/meta/_journal.json

@@ -2101,6 +2101,13 @@
       "when": 1787360221351,
       "tag": "0300_hesitant_war_machine",
       "breakpoints": true
+    },
+    {
+      "idx": 301,
+      "version": "7",
+      "when": 1787365065919,
+      "tag": "0301_backfill_table_default_views",
+      "breakpoints": true
     }
   ]
 }