feat: overhaul with modular API, agent endpoints, migrations, backup and tests

- Split monolithic app.py into server/api/ routers
- Add Pydantic schemas for input validation
- Add /agent/* API with separate AGENT_TOKEN auth
- Replace static schema.sql with versioned migrations (datenerhaltend)
- Add tools/backup_db.py for SQLite backups
- Add Dockerfile HEALTHCHECK and compose.yml AGENT_TOKEN env
- Add pytest tests for user and agent API
- Update README with API docs and deployment safety notes
- Bump version to 1.2.0

tools/backup_db.py

@@ -0,0 +1,88 @@
+#!/usr/bin/env python3
+"""Backup the SQLite database used by TakeYourMeds.
+
+Usage:
+    python tools/backup_db.py [destination_dir]
+
+Defaults to ./data/backups/ and keeps the last 14 backups.
+"""
+from __future__ import annotations
+
+import argparse
+import gzip
+import logging
+import pathlib
+import shutil
+import sys
+from datetime import UTC, datetime
+
+from server.settings import settings
+
+logger = logging.getLogger(__name__)
+logging.basicConfig(level=logging.INFO, format="%(levelname)s: %(message)s")
+
+DEFAULT_KEEP = 14
+
+
+def backup_db(destination: pathlib.Path | None = None, keep: int = DEFAULT_KEEP) -> pathlib.Path:
+    src = pathlib.Path(settings.db_path)
+    if not src.exists():
+        raise FileNotFoundError(f"Database not found: {src}")
+
+    dest_dir = destination or pathlib.Path(src.parent) / "backups"
+    dest_dir.mkdir(parents=True, exist_ok=True)
+
+    timestamp = datetime.now(UTC).strftime("%Y%m%dT%H%M%SZ")
+    dest_file = dest_dir / f"medis-{timestamp}.sqlite.gz"
+
+    # SQLite backup via online copy is safe because WAL is not enabled by default.
+    # For guaranteed consistency under writes, use the backup API.
+    import aiosqlite
+
+    async def _copy() -> None:
+        async with (
+            aiosqlite.connect(str(src)) as src_db,
+            aiosqlite.connect(str(dest_file).replace(".gz", "")) as dst_db,
+        ):
+            await src_db.backup(dst_db)
+
+    import asyncio
+
+    plain = dest_file.with_suffix("")
+    asyncio.run(_copy())
+
+    with open(plain, "rb") as f_in, gzip.open(dest_file, "wb") as f_out:
+        shutil.copyfileobj(f_in, f_out)
+    plain.unlink()
+
+    logger.info("Backup created: %s", dest_file)
+
+    _rotate(dest_dir, keep)
+    return dest_file
+
+
+def _rotate(dest_dir: pathlib.Path, keep: int) -> None:
+    backups = sorted(dest_dir.glob("medis-*.sqlite.gz"))
+    if len(backups) > keep:
+        for old in backups[:-keep]:
+            old.unlink()
+            logger.info("Removed old backup: %s", old.name)
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description="Backup TakeYourMeds SQLite database")
+    parser.add_argument("destination", nargs="?", help="Backup directory (default: ./data/backups)")
+    parser.add_argument("--keep", type=int, default=DEFAULT_KEEP, help=f"Number of backups to keep (default: {DEFAULT_KEEP})")
+    args = parser.parse_args()
+
+    dest = pathlib.Path(args.destination) if args.destination else None
+    try:
+        backup_db(dest, keep=args.keep)
+        return 0
+    except Exception as exc:
+        logger.error("Backup failed: %s", exc)
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())