merged from gramsrv upstream

deploy/migrations/20260901000018_channel_membership_batch_lock_order.down.sql

@@ -0,0 +1,62 @@
+CREATE OR REPLACE FUNCTION public.telesrv_bump_channel_membership_read_models(
+    p_channel_id bigint,
+    p_user_ids bigint[]
+)
+RETURNS void
+LANGUAGE plpgsql
+AS $$
+DECLARE
+    changed record;
+BEGIN
+    IF COALESCE(p_channel_id, 0) <= 0 OR COALESCE(cardinality(p_user_ids), 0) = 0 THEN
+        RETURN;
+    END IF;
+
+    FOR changed IN
+        WITH requested AS MATERIALIZED (
+            SELECT DISTINCT user_id
+            FROM unnest(p_user_ids) AS input(user_id)
+            WHERE user_id > 0
+        ), keys AS MATERIALIZED (
+            SELECT 'channel_participants'::text AS model, 0::bigint AS owner_user_id,
+                   'channel'::text AS peer_type, p_channel_id AS peer_id
+            UNION
+            SELECT 'channel_member', user_id, 'channel', p_channel_id FROM requested
+            UNION
+            SELECT 'dialog_light', user_id, 'channel', p_channel_id FROM requested
+            UNION
+            SELECT 'dialog_owner', user_id, 'user', user_id FROM requested
+            UNION
+            SELECT 'channel_active_memberships', user_id, 'user', user_id FROM requested
+        ), bumped AS (
+            INSERT INTO public.read_model_versions (
+                model, owner_user_id, peer_type, peer_id, version, hash, updated_at
+            )
+            SELECT model, owner_user_id, peer_type, peer_id, 1,
+                   public.telesrv_random_read_model_hash(), now()
+            FROM keys
+            ORDER BY model, owner_user_id, peer_type, peer_id
+            ON CONFLICT (model, owner_user_id, peer_type, peer_id) DO UPDATE SET
+                version = public.read_model_versions.version + 1,
+                hash = public.telesrv_random_read_model_hash(),
+                updated_at = EXCLUDED.updated_at
+            RETURNING model, owner_user_id, peer_type, peer_id, version, hash
+        )
+        SELECT model, owner_user_id, peer_type, peer_id, version, hash
+        FROM bumped
+        ORDER BY model, owner_user_id, peer_type, peer_id
+    LOOP
+        PERFORM pg_notify(
+            'telesrv_read_model_changed',
+            json_build_object(
+                'model', changed.model,
+                'owner_user_id', changed.owner_user_id,
+                'peer_type', changed.peer_type,
+                'peer_id', changed.peer_id,
+                'version', changed.version,
+                'hash', changed.hash
+            )::text
+        );
+    END LOOP;
+END;
+$$;