fix: remove obsolete landlord profile indexes migration

AGENTS.md

@@ -70,6 +70,7 @@ Use the single-context documentation layout. See [domain.md](file:///home/nessar
 - Define explicit input, output, API, and domain types.
 - Prefer unions and enums over loosely related strings or multiple boolean flags.
 - Use immutable transformations where practical.
+- Do not use regular-expression `.test()` calls unless they are the only valid option and the user has explicitly authorized them; prefer more readable, maintainable validation alternatives.
 - Avoid non-null assertions unless the invariant is guaranteed and clear.
 - Validate data received from external APIs instead of trusting type assertions.
 

backend/migrations/20260717-landlord-profile-indexes.js

@@ -1,9 +0,0 @@
-db.getSiblingDB('lmnp').landlords.createIndex(
-  { oidcSubject: 1 },
-  { name: 'landlords_oidc_subject_unique', unique: true, sparse: true },
-);
-
-db.getSiblingDB('lmnp').landlords.createIndex(
-  { email: 1 },
-  { name: 'landlords_email_unique', unique: true, sparse: true },
-);