diff --git a/crates/adapters/postgres/migrations/004_search_indexes.sql b/crates/adapters/postgres/migrations/004_search_indexes.sql
new file mode 100644
index 0000000..a524b56
--- /dev/null
+++ b/crates/adapters/postgres/migrations/004_search_indexes.sql
@@ -0,0 +1,11 @@
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+
+CREATE INDEX IF NOT EXISTS idx_thoughts_content_trgm
+    ON thoughts USING GIN(content gin_trgm_ops);
+
+CREATE INDEX IF NOT EXISTS idx_users_username_trgm
+    ON users USING GIN(username gin_trgm_ops);
+
+CREATE INDEX IF NOT EXISTS idx_users_display_name_trgm
+    ON users USING GIN(display_name gin_trgm_ops)
+    WHERE display_name IS NOT NULL;