core: fix deleting user with chat tags (#6374)

* core: fix deleting user with chat tags

* schema, tests

* schema

* update simplexmq

* update ios

* plans

src/Simplex/Chat/Store/Postgres/Migrations.hs

@@ -20,6 +20,7 @@ import Simplex.Chat.Store.Postgres.Migrations.M20250813_delivery_tasks
 import Simplex.Chat.Store.Postgres.Migrations.M20250919_group_summary
 import Simplex.Chat.Store.Postgres.Migrations.M20250922_remove_unused_connections
 import Simplex.Chat.Store.Postgres.Migrations.M20251007_connections_sync
+import Simplex.Chat.Store.Postgres.Migrations.M20251017_chat_tags_cascade
 import Simplex.Messaging.Agent.Store.Shared (Migration (..))
 
 schemaMigrations :: [(String, Text, Maybe Text)]
@@ -39,7 +40,8 @@ schemaMigrations =
     ("20250813_delivery_tasks", m20250813_delivery_tasks, Just down_m20250813_delivery_tasks),
     ("20250919_group_summary", m20250919_group_summary, Just down_m20250919_group_summary),
     ("20250922_remove_unused_connections", m20250922_remove_unused_connections, Just down_m20250922_remove_unused_connections),
-    ("20251007_connections_sync", m20251007_connections_sync, Just down_m20251007_connections_sync)
+    ("20251007_connections_sync", m20251007_connections_sync, Just down_m20251007_connections_sync),
+    ("20251017_chat_tags_cascade", m20251017_chat_tags_cascade, Just down_m20251017_chat_tags_cascade)
   ]
 
 -- | The list of migrations in ascending order by date

src/Simplex/Chat/Store/Postgres/Migrations/M20251017_chat_tags_cascade.hs

@@ -0,0 +1,32 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Chat.Store.Postgres.Migrations.M20251017_chat_tags_cascade where
+
+import Data.Text (Text)
+import qualified Data.Text as T
+import Text.RawString.QQ (r)
+
+m20251017_chat_tags_cascade :: Text
+m20251017_chat_tags_cascade =
+  T.pack
+    [r|
+ALTER TABLE chat_tags DROP CONSTRAINT chat_tags_user_id_fkey;
+
+ALTER TABLE chat_tags
+  ADD CONSTRAINT chat_tags_user_id_fkey
+  FOREIGN KEY (user_id)
+  REFERENCES users(user_id)
+  ON DELETE CASCADE;
+|]
+
+down_m20251017_chat_tags_cascade :: Text
+down_m20251017_chat_tags_cascade =
+  T.pack
+    [r|
+ALTER TABLE chat_tags DROP CONSTRAINT chat_tags_user_id_fkey;
+
+ALTER TABLE chat_tags
+  ADD CONSTRAINT chat_tags_user_id_fkey
+  FOREIGN KEY (user_id)
+  REFERENCES users(user_id);
+|]

src/Simplex/Chat/Store/Postgres/Migrations/chat_schema.sql

@@ -2479,7 +2479,7 @@ ALTER TABLE ONLY test_chat_schema.chat_tags_chats
 
 
 ALTER TABLE ONLY test_chat_schema.chat_tags
-    ADD CONSTRAINT chat_tags_user_id_fkey FOREIGN KEY (user_id) REFERENCES test_chat_schema.users(user_id);
+    ADD CONSTRAINT chat_tags_user_id_fkey FOREIGN KEY (user_id) REFERENCES test_chat_schema.users(user_id) ON DELETE CASCADE;