#!/bin/sh
# =============================================================================
# prestart.sh — Container entrypoint for CRM System
#
# Responsibilities:
#   1. Run Alembic DB migrations (alembic upgrade head).
#   2. Start uvicorn as PID 1 (so signals like SIGTERM are forwarded correctly).
#
# Notes:
#   - `set -e` ensures the container crashes loudly if migrations fail,
#     rather than starting a broken app on an inconsistent schema.
#   - `exec uvicorn ...` replaces the shell process with uvicorn, so uvicorn
#     becomes PID 1 and receives Docker's SIGTERM directly for graceful shutdown.
#   - `--workers 1` is intentional for v1: SQLite (dev) is single-threaded,
#     and asyncpg (prod) scales fine with one worker + an async connection pool.
# =============================================================================

set -e

echo "[prestart] $(date -u +%Y-%m-%dT%H:%M:%SZ) - Running alembic upgrade head..."
alembic upgrade head
echo "[prestart] DB migrations completed successfully."

echo "[prestart] Starting uvicorn on 0.0.0.0:8000 (workers=1)..."
exec uvicorn app.main:app \
    --host 0.0.0.0 \
    --port 8000 \
    --workers 1