snapshot of https://github.com/tldraw/tldraw.git (main, 2026-09-23; blobs > 131072B omitted)

apps/dotcom/zero-cache/migrations/012_prevent_deadlocks.sql

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+CREATE OR REPLACE FUNCTION update_file_state_on_file_change() RETURNS TRIGGER AS $$
+BEGIN
+  IF OLD."ownerId" IS DISTINCT FROM NEW."ownerId" THEN
+    UPDATE file_state
+    SET "isFileOwner" = (file_state."userId" = NEW."ownerId")
+    WHERE file_state."fileId" = NEW.id;
+  END IF;
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+
+CREATE OR REPLACE FUNCTION update_is_file_owner() RETURNS TRIGGER AS $$
+BEGIN
+  IF TG_OP = 'INSERT' THEN
+    NEW."isFileOwner" := (NEW."userId" = (SELECT "ownerId" FROM file WHERE file.id = NEW."fileId"));
+  ELSIF TG_OP = 'UPDATE' THEN
+    IF NEW."userId" IS DISTINCT FROM OLD."userId" THEN
+      NEW."isFileOwner" := (NEW."userId" = (SELECT "ownerId" FROM file WHERE file.id = NEW."fileId"));
+    END IF;
+  END IF;
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;