Add function to improve search performance.

Author: ChrisPenner

sql/2025-12-15_faster-project-permissions.sql

@@ -0,0 +1,49 @@
+-- The previous user_has_project_permission function is called on _every_ project when doing global omnisearch,
+-- which is too slow.
+
+-- Create a view which serves as join table for finding projects we should consider in search, it's much faster
+-- than running a permission check for every private project.
+CREATE FUNCTION projects_searchable_by_user(arg_user_id UUID)
+-- Returns a subset of the projects table
+RETURNS SETOF projects AS $$
+  -- Get all public projects and projects owned by the user,
+  -- as well as all public projects.
+  SELECT p.*
+    FROM projects p
+    WHERE p.owner_user_id = arg_user_id 
+      OR NOT p.private
+UNION
+  SELECT
+    p.*
+    FROM org_members om
+      JOIN projects p 
+        ON om.organization_user_id = p.owner_user_id
+      JOIN roles r ON om.role_id = r.id
+      WHERE om.member_user_id = arg_user_id
+        AND 'project:view' = ANY(r.permissions)
+        -- All public projects are already included above
+        AND p.private
+  UNION
+  -- Include projects the user is a direct maintainer of
+  SELECT
+    p.*
+    FROM users u
+      JOIN role_memberships rm ON u.subject_id = rm.subject_id
+      JOIN roles r ON rm.role_id = r.id
+      JOIN projects p ON rm.resource_id = p.resource_id
+      WHERE u.id = arg_user_id
+        AND 'project:view' = ANY(r.permissions)
+        AND p.private;
+$$ LANGUAGE sql STABLE PARALLEL SAFE;
+
+-- A better index for this query.
+-- CREATE INDEX idx_projects_by_owner_and_privacy
+--   ON projects (private, owner_user_id);
+
+CREATE INDEX idx_public_projects_by_owner
+  ON projects (owner_user_id)
+  WHERE NOT private;
+
+CREATE INDEX idx_private_projects_by_owner
+  ON projects (owner_user_id)
+  WHERE private;