diff --git a/prisma/migrations/20251107090000_add_my_reviews_indexes/migration.sql b/prisma/migrations/20251107090000_add_my_reviews_indexes/migration.sql
index 5a09bb0..b06bddc 100644
--- a/prisma/migrations/20251107090000_add_my_reviews_indexes/migration.sql
+++ b/prisma/migrations/20251107090000_add_my_reviews_indexes/migration.sql
@@ -11,11 +11,6 @@ CREATE EXTENSION IF NOT EXISTS "uuid-ossp" WITH SCHEMA skills;
 CREATE INDEX IF NOT EXISTS "challenge_status_type_track_created_at_idx"
   ON "Challenge" ("status", "typeId", "trackId", "createdAt" DESC);
 
-DROP INDEX IF EXISTS "challenge_name_idx";
-
-CREATE INDEX IF NOT EXISTS "challenge_name_trgm_idx"
-  ON "Challenge" USING gin ("name" pg_catalog.gin_trgm_ops);
-
 DO
 $$
 DECLARE
diff --git a/prisma/migrations/20251122120000_drop_phase_order_idx_allow_null_ai_reviewer/migration.sql b/prisma/migrations/20251122120000_drop_phase_order_idx_allow_null_ai_reviewer/migration.sql
new file mode 100644
index 0000000..5079601
--- /dev/null
+++ b/prisma/migrations/20251122120000_drop_phase_order_idx_allow_null_ai_reviewer/migration.sql
@@ -0,0 +1,46 @@
+-- Remove deprecated ChallengePhase ordering index and allow AI reviewer flag to be nullable.
+
+DO
+$$
+DECLARE
+  idx_schema TEXT;
+BEGIN
+  SELECT n.nspname
+    INTO idx_schema
+    FROM pg_class c
+    JOIN pg_namespace n ON n.oid = c.relnamespace
+   WHERE c.relname = 'challenge_phase_order_idx'
+     AND c.relkind = 'i'
+   LIMIT 1;
+
+  IF idx_schema IS NOT NULL THEN
+    EXECUTE format('DROP INDEX %I.%I', idx_schema, 'challenge_phase_order_idx');
+  END IF;
+END
+$$ LANGUAGE plpgsql;
+
+DO
+$$
+DECLARE
+  tbl_schema TEXT;
+BEGIN
+  SELECT n.nspname
+    INTO tbl_schema
+    FROM pg_class c
+    JOIN pg_namespace n ON n.oid = c.relnamespace
+   WHERE c.relname = 'DefaultChallengeReviewer'
+     AND c.relkind = 'r'
+   LIMIT 1;
+
+  IF tbl_schema IS NULL THEN
+    RETURN;
+  END IF;
+
+  EXECUTE format(
+    'ALTER TABLE %I.%I ALTER COLUMN %I DROP NOT NULL',
+    tbl_schema,
+    'DefaultChallengeReviewer',
+    'isAIReviewer'
+  );
+END
+$$ LANGUAGE plpgsql;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 76fa346..c5d96cc 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -5,7 +5,7 @@ datasource db {
 
 generator client {
   provider        = "prisma-client-js"
-  previewFeatures = ["fullTextSearchPostgres", "postgresqlExtensions"]
+  previewFeatures = ["fullTextSearchPostgres", "postgresqlExtensions", "views"]
 }
 
 // Enum for allowed challenge track values (matches app-constants)
@@ -157,7 +157,6 @@ model Challenge {
   @@index([status, startDate])
   @@index([trackId, typeId, status])
   @@index([status, typeId, trackId, createdAt(sort: Desc)], map: "challenge_status_type_track_created_at_idx")
-  @@index([name(ops: raw("pg_catalog.gin_trgm_ops"))], type: Gin, map: "challenge_name_trgm_idx")
   @@index([legacyId])
   @@index([projectId, status])
 }
@@ -166,13 +165,12 @@ model Challenge {
 // MemberChallengeAccess view – member/challenge pairs from resources schema
 //////////////////////////////////////////
 
-model MemberChallengeAccess {
+view MemberChallengeAccess {
   challengeId String
   memberId    String
 
   challenge Challenge @relation(fields: [challengeId], references: [id])
 
-  @@id([challengeId, memberId])
   @@map("MemberChallengeAccess")
 }
 
@@ -660,7 +658,7 @@ model DefaultChallengeReviewer {
   baseCoefficient           Float?
   incrementalCoefficient    Float?
   opportunityType       ReviewOpportunityTypeEnum?
-  isAIReviewer          Boolean
+  isAIReviewer          Boolean?
   shouldOpenOpportunity Boolean                    @default(true)
 
   // Relations