init commit. Skeleton prepared

services/chat/Dockerfile

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+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir --upgrade pip \
+ && pip install --no-cache-dir -r requirements.txt
+
+COPY src ./src
+COPY alembic.ini ./
+COPY alembic ./alembic
+COPY docker-entrypoint.sh ./
+ENV PYTHONPATH=/app/src
+EXPOSE 8000
+CMD ["./docker-entrypoint.sh"]

services/chat/alembic.ini

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+[alembic]
+script_location = alembic
+timezone = UTC
+
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers = console
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stdout,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s %(name)s %(message)s

services/chat/alembic/env.py

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+from __future__ import annotations
+import os
+import sys
+from logging.config import fileConfig
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+# Add ./src to sys.path
+BASE_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
+SRC_DIR = os.path.join(BASE_DIR, "src")
+if SRC_DIR not in sys.path:
+    sys.path.append(SRC_DIR)
+
+from app.db.session import Base  # noqa
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+DATABASE_URL = os.getenv("DATABASE_URL")
+
+def run_migrations_offline() -> None:
+    url = DATABASE_URL
+    if not url:
+        raise RuntimeError("DATABASE_URL is not set")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        compare_type=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+def run_migrations_online() -> None:
+    url = DATABASE_URL
+    if not url:
+        raise RuntimeError("DATABASE_URL is not set")
+    connectable = engine_from_config(
+        {"sqlalchemy.url": url},
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata, compare_type=True)
+        with context.begin_transaction():
+            context.run_migrations()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

services/chat/docker-entrypoint.sh

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+#!/usr/bin/env sh
+set -e
+# Run migrations (no-op if no revisions yet)
+alembic -c alembic.ini upgrade head || true
+# Start app
+exec uvicorn app.main:app --host 0.0.0.0 --port 8000

services/chat/requirements.txt

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+fastapi
+uvicorn[standard]
+SQLAlchemy>=2.0
+psycopg2-binary
+alembic
+pydantic>=2
+pydantic-settings
+python-dotenv
+httpx>=0.27
+pytest

services/chat/src/app/api/routes/ping.py

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+from fastapi import APIRouter
+
+router = APIRouter()
+
+@router.get("/ping")
+def ping():
+    return {"ping": "pong"}

services/chat/src/app/core/config.py

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+from pydantic_settings import BaseSettings
+
+class Settings(BaseSettings):
+    database_url: str | None = None
+
+    class Config:
+        env_prefix = ""
+        env_file = ".env"
+        case_sensitive = False

services/chat/src/app/db/session.py

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+import os
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, DeclarativeBase
+from typing import Generator
+
+DEFAULT_DB_URL = "postgresql+psycopg2://postgres:postgres@postgres:5432/chat_db"
+
+class Base(DeclarativeBase):
+    pass
+
+DATABASE_URL = os.getenv("DATABASE_URL", DEFAULT_DB_URL)
+
+engine = create_engine(
+    DATABASE_URL,
+    pool_pre_ping=True,
+    future=True,
+)
+
+SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False)
+
+def get_db() -> Generator:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

services/chat/src/app/main.py

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+from fastapi import FastAPI
+from .api.routes.ping import router as ping_router
+
+app = FastAPI(title="CHAT Service")
+
+@app.get("/health")
+def health():
+    return {"status": "ok", "service": "chat"}
+
+# v1 API
+app.include_router(ping_router, prefix="/v1")

services/chat/src/app/models/base.py

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+from app.db.session import Base  # re-export for convenience

services/chat/src/app/repositories/base.py

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+from sqlalchemy.orm import Session
+
+class BaseRepository:
+    def __init__(self, db: Session):
+        self.db = db

services/chat/src/app/schemas/common.py

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+from pydantic import BaseModel
+
+class Message(BaseModel):
+    message: str

services/chat/src/app/services/base.py

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+from sqlalchemy.orm import Session
+
+class BaseService:
+    def __init__(self, db: Session):
+        self.db = db

services/chat/tests/test_health.py

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+from fastapi.testclient import TestClient
+from app.main import app
+
+client = TestClient(app)
+
+def test_health():
+    r = client.get("/health")
+    assert r.status_code == 200
+    data = r.json()
+    assert data.get("status") == "ok"