fix: scim id was not unique (#6450)

This PR drops the previous PRs scim_id idx and replaces it with an
actual UNIQUE index

src/migrations/20240305131822-add-scim-id-column-to-user.js

@@ -1,13 +1,13 @@
 exports.up = function(db, cb) {
   db.runSql(`
     ALTER TABLE users ADD COLUMN scim_id TEXT;
-    CREATE INDEX users_scim_id_uniq_idx ON users (scim_id) WHERE scim_id IS NOT NULL;
+    CREATE INDEX IF NOT EXISTS users_scim_id_uniq_idx ON users (scim_id) WHERE scim_id IS NOT NULL;
   `, cb);
 };
 
 exports.down = function(db, cb) {
   db.runSql(`
-    DROP INDEX users_scim_id_uniq_idx;
+    DROP INDEX IF EXISTS users_scim_id_uniq_idx;
     ALTER TABLE users DROP COLUMN scim_id;
   `, cb);
 };

src/migrations/20240306145609-make-scim-id-idx-unique.js

@@ -0,0 +1,8 @@
+exports.up = function(db, cb) {
+  db.runSql(`DROP INDEX IF EXISTS users_scim_id_uniq_idx;
+             CREATE UNIQUE INDEX users_scim_id_unique_idx ON users(scim_id) WHERE scim_id IS NOT NULL`, cb);
+};
+
+exports.down = function(db, cb) {
+  db.runSql(`DROP INDEX IF EXISTS users_scim_id_unique_idx;`, cb);
+};