fix: add organization_id IS NOT NULL to unique index WHERE clause

NULL values are treated as distinct in PostgreSQL unique indexes, so the
pending invite uniqueness constraint was ineffective for orphaned rows
after ON DELETE SET NULL.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: adaam2

server/database/schema.sql

@@ -1235,7 +1235,7 @@ CREATE TABLE IF NOT EXISTS team_invites (
 -- Unique constraint on organization + email for non-deleted pending invites
 CREATE UNIQUE INDEX IF NOT EXISTS team_invites_organization_id_email_pending_key
 ON team_invites (organization_id, email)
-WHERE deleted IS FALSE AND status = 'pending';
+WHERE deleted IS FALSE AND status = 'pending' AND organization_id IS NOT NULL;
 
 -- Index for looking up invites by token
 CREATE UNIQUE INDEX IF NOT EXISTS team_invites_token_key

server/migrations/20260129231659_team-invites.sql

@@ -19,6 +19,6 @@ CREATE TABLE "team_invites" (
   CONSTRAINT "team_invites_token_check" CHECK ((token <> ''::text) AND (char_length(token) <= 64))
 );
 -- Create index "team_invites_organization_id_email_pending_key" to table: "team_invites"
-CREATE UNIQUE INDEX "team_invites_organization_id_email_pending_key" ON "team_invites" ("organization_id", "email") WHERE ((deleted IS FALSE) AND (status = 'pending'::text));
+CREATE UNIQUE INDEX "team_invites_organization_id_email_pending_key" ON "team_invites" ("organization_id", "email") WHERE ((deleted IS FALSE) AND (status = 'pending'::text) AND (organization_id IS NOT NULL));
 -- Create index "team_invites_token_key" to table: "team_invites"
 CREATE UNIQUE INDEX "team_invites_token_key" ON "team_invites" ("token") WHERE (deleted IS FALSE);

server/migrations/atlas.sum

@@ -1,4 +1,4 @@
-h1:ZJuz4453+zjs/it/BeGleRAvbL9YdcpNBARTBbSFOEI=
+h1:4d6gOQGMy17apziY4ctR9d2z+f5OpvyXMfl65JF08V4=
 20250502122425_initial-tables.sql h1:Hu3O60/bB4fjZpUay8FzyOjw6vngp087zU+U/wVKn7k=
 20250502130852_initial-indexes.sql h1:oYbnwi9y9PPTqu7uVbSPSALhCY8XF3rv03nDfG4b7mo=
 20250502154250_relax-http-security-fields.sql h1:0+OYIDq7IHmx7CP5BChVwfpF2rOSrRDxnqawXio2EVo=
@@ -94,4 +94,4 @@ h1:ZJuz4453+zjs/it/BeGleRAvbL9YdcpNBARTBbSFOEI=
 20260127183030_add_header_definitions_for_external_mcp.sql h1:zhgPD7ecRzM2VFj67jchsx0TiBLpLD4QoIvgT+7TKSw=
 20260129164323_install_redirect.sql h1:QK9StZ1pz4N+oRPcNYFeOx8AVt2tQBRJC+NRKJSeWOk=
 20260129194537_api-key-last-accessed.sql h1:2ggrS/lKJnBS6HSll9akkQg9SZSYy03W839YxU46+mU=
-20260129231659_team-invites.sql h1:kem7iguG/YDPGycaOkB4gtsBrHPyP1VYKRapt0Dddbg=
+20260129231659_team-invites.sql h1:9fsHRTPuyD+C8+KefUbSZZMHOoXuq+pCocumha6UI3A=