Focused FastAPI-Startkit vs SQLAlchemy-async benchmark across sqlite/postgres/mysql

- Strip suite to just fastapi_startkit and sqlalchemy_async (bench.sh + dirs).
- Fix Postgres/MySQL configs: set explicit url (the *Config dataclasses ship a
  bogus default url=sqlite+aiosqlite://..., and build_url prefers url over
  host/port, so PG/MySQL silently fell back to SQLite).
- test_i: use builder update() instead of instance.save() for consistency with
  test_j.

Author: tmgbedu

benchmarks/bench.sh

@@ -17,44 +17,23 @@ echo Test 1
 export TEST=1
 printf '' > outfile1
 
-django/bench.sh | tee -a outfile1
-peewee/bench.sh | tee -a outfile1
 sqlalchemy_async/bench.sh | tee -a outfile1
-sqlobject/bench.sh | tee -a outfile1
-tortoise/bench.sh | tee -a outfile1
-piccolo/bench.sh | tee -a outfile1
-ormar/bench.sh | tee -a outfile1
-sqlmodel/bench.sh | tee -a outfile1
 fastapi_startkit/bench.sh | tee -a outfile1
 
 
 echo Test 2
 export TEST=2
 printf '' > outfile2
 
-django/bench.sh | tee -a outfile2
-peewee/bench.sh | tee -a outfile2
 sqlalchemy_async/bench.sh | tee -a outfile2
-sqlobject/bench.sh | tee -a outfile2
-tortoise/bench.sh | tee -a outfile2
-piccolo/bench.sh | tee -a outfile2
-ormar/bench.sh | tee -a outfile2
-sqlmodel/bench.sh | tee -a outfile2
 fastapi_startkit/bench.sh | tee -a outfile2
 
 
 echo Test 3
 export TEST=3
 printf '' > outfile3
 
-django/bench.sh | tee -a outfile3
-peewee/bench.sh | tee -a outfile3
 sqlalchemy_async/bench.sh | tee -a outfile3
-sqlobject/bench.sh | tee -a outfile3
-tortoise/bench.sh | tee -a outfile3
-piccolo/bench.sh | tee -a outfile3
-ormar/bench.sh | tee -a outfile3
-sqlmodel/bench.sh | tee -a outfile3
 fastapi_startkit/bench.sh | tee -a outfile3
 
 echo `python -V`, Iterations: $ITERATIONS DBtype: $DBTYPE | tee -a results