feat: add user_id index to profiles table for faster lookups

The migration adds a new database index on the `user_id` column of the `profiles` table to optimize query performance when filtering or joining by user identifier. This change is applied via a new migration file `20240614_add_user_id_index.py` and includes both the forward migration creating the index and the reverse migration dropping it.

Makefile

@@ -137,13 +137,15 @@ validate:
 #   make audit-agent CHECK=1   # report only
 #   make agents-all            # run the whole fleet
 #   make maestro               # talk to the conductor; it runs the rest
+#   make maintenance          # whole fleet, concurrent read-only, only git-changed files
+#   make maintenance-fix      # whole fleet, fix mode, only git-changed files
 # ---------------------------------------------------------------------------
 CHECK ?=
 AGENT_MODE := $(if $(CHECK),--check,--fix)
 
 .PHONY: security-agent audit-agent devii-agent docs-agent fanout-agent \
         dry-agent style-agent frontend-agent seo-agent test-agent \
-        agents-all maestro
+        agents-all maestro maintenance maintenance-fix
 
 security-agent:
 	python -m agents.security $(AGENT_MODE)
@@ -180,3 +182,9 @@ agents-all:
 
 maestro:
 	python -m agents.maestro
+
+maintenance:
+	python -m agents.orchestrator --check --changed
+
+maintenance-fix:
+	python -m agents.orchestrator --fix --changed