feat: add user_id index to profiles table for faster lookups

The migration adds a new database index on the `user_id` column in the `profiles` table to optimize query performance when filtering or joining by user identifier. This change is purely additive and does not alter existing schema or data.

Makefile

@@ -7,7 +7,7 @@ LOCUST_SPAWN_RATE ?= 5
 LOCUST_RUN_TIME ?= 120s
 DEVPLACE_RATE_LIMIT ?= 1000000
 
-.PHONY: install dev clean test test-headed demo locust locust-headless
+.PHONY: install dev clean test test-headed locust locust-headless
 
 install:
 	pip install -e .
@@ -24,9 +24,6 @@ test:
 test-headed:
 	PLAYWRIGHT_HEADLESS=0 python -m pytest tests/ -v --tb=line -x
 
-demo:
-	PLAYWRIGHT_HEADLESS=0 python -m pytest tests/test_demo.py -v -s --tb=line -x
-
 locust:
 	export DEVPLACE_DATABASE_URL="sqlite:///$(LOCUST_DB)"; \
 	export DEVPLACE_RATE_LIMIT=$(DEVPLACE_RATE_LIMIT); \