Migrate poo recorder and align Alembic naming

scripts/poo_db_adopt.py

@@ -0,0 +1,172 @@
+from __future__ import annotations
+
+import sqlite3
+import sys
+from pathlib import Path
+
+from alembic import command
+from alembic.config import Config
+
+PROJECT_ROOT = Path(__file__).resolve().parents[1]
+if str(PROJECT_ROOT) not in sys.path:
+    sys.path.insert(0, str(PROJECT_ROOT))
+
+from app.config import get_settings
+
+POO_BASELINE_REVISION = "20260420_01_poo_baseline"
+EXPECTED_USER_VERSION = 1
+EXPECTED_POO_TABLE_INFO = [
+    (0, "timestamp", "TEXT", 1, None, 1),
+    (1, "status", "TEXT", 1, None, 0),
+    (2, "latitude", "REAL", 1, None, 0),
+    (3, "longitude", "REAL", 1, None, 0),
+]
+
+
+class PooDatabaseAdoptionError(RuntimeError):
+    """Raised when a legacy poo database does not match the expected baseline."""
+
+
+def _database_path_from_url(database_url: str) -> Path:
+    prefix = "sqlite:///"
+    if not database_url.startswith(prefix):
+        raise PooDatabaseAdoptionError(
+            f"Only sqlite URLs are supported for poo DB adoption, got: {database_url}"
+        )
+    return Path(database_url[len(prefix) :])
+
+
+def _make_alembic_config(database_url: str) -> Config:
+    config = Config("alembic_poo.ini")
+    config.set_main_option("sqlalchemy.url", database_url)
+    return config
+
+
+def _poo_table_exists(database_path: Path) -> bool:
+    conn = sqlite3.connect(database_path)
+    try:
+        row = conn.execute(
+            "SELECT 1 FROM sqlite_master WHERE type = 'table' AND name = 'poo_records'"
+        ).fetchone()
+        return row is not None
+    finally:
+        conn.close()
+
+
+def _alembic_version_table_exists(database_path: Path) -> bool:
+    conn = sqlite3.connect(database_path)
+    try:
+        row = conn.execute(
+            "SELECT 1 FROM sqlite_master WHERE type = 'table' AND name = 'alembic_version'"
+        ).fetchone()
+        return row is not None
+    finally:
+        conn.close()
+
+
+def _fetch_alembic_revision(database_path: Path) -> str:
+    conn = sqlite3.connect(database_path)
+    try:
+        row = conn.execute("SELECT version_num FROM alembic_version").fetchone()
+        if row is None:
+            raise PooDatabaseAdoptionError("Alembic version table exists but contains no revision")
+        return row[0]
+    finally:
+        conn.close()
+
+
+def _fetch_poo_table_info(database_path: Path) -> list[tuple]:
+    conn = sqlite3.connect(database_path)
+    try:
+        return list(conn.execute("PRAGMA table_info(poo_records)"))
+    finally:
+        conn.close()
+
+
+def _fetch_user_version(database_path: Path) -> int:
+    conn = sqlite3.connect(database_path)
+    try:
+        return conn.execute("PRAGMA user_version").fetchone()[0]
+    finally:
+        conn.close()
+
+
+def validate_legacy_poo_db(database_url: str) -> None:
+    database_path = _database_path_from_url(database_url)
+    if not database_path.exists():
+        raise PooDatabaseAdoptionError(f"Poo DB file does not exist: {database_path}")
+
+    if not _poo_table_exists(database_path):
+        raise PooDatabaseAdoptionError("Expected table 'poo_records' was not found in the DB")
+
+    table_info = _fetch_poo_table_info(database_path)
+    if table_info != EXPECTED_POO_TABLE_INFO:
+        raise PooDatabaseAdoptionError("Poo table schema does not match the expected baseline")
+
+    user_version = _fetch_user_version(database_path)
+    if user_version != EXPECTED_USER_VERSION:
+        raise PooDatabaseAdoptionError(
+            f"Expected PRAGMA user_version = {EXPECTED_USER_VERSION}, got {user_version}"
+        )
+
+
+def validate_poo_runtime_db(database_url: str) -> None:
+    database_path = _database_path_from_url(database_url)
+    if not database_path.exists():
+        raise PooDatabaseAdoptionError(
+            "Poo DB file was not found. Run 'python scripts/poo_db_adopt.py' first to "
+            "initialize or adopt the poo DB before starting the app."
+        )
+
+    if not _alembic_version_table_exists(database_path):
+        raise PooDatabaseAdoptionError(
+            "Poo DB exists but is not yet Alembic-managed. Run "
+            "'python scripts/poo_db_adopt.py' first to adopt the legacy DB "
+            "before starting the app."
+        )
+
+    current_revision = _fetch_alembic_revision(database_path)
+    if current_revision != POO_BASELINE_REVISION:
+        raise PooDatabaseAdoptionError(
+            "Poo DB revision mismatch. Refusing to start the app: "
+            f"expected {POO_BASELINE_REVISION}, got {current_revision}"
+        )
+
+
+def adopt_or_initialize_poo_db(database_url: str) -> str:
+    database_path = _database_path_from_url(database_url)
+    alembic_config = _make_alembic_config(database_url)
+
+    if database_path.exists():
+        if _alembic_version_table_exists(database_path):
+            current_revision = _fetch_alembic_revision(database_path)
+            if current_revision != POO_BASELINE_REVISION:
+                raise PooDatabaseAdoptionError(
+                    "Poo DB is already Alembic-managed but revision does not match "
+                    f"the expected baseline: expected {POO_BASELINE_REVISION}, "
+                    f"got {current_revision}"
+                )
+            return "already_managed"
+
+        validate_legacy_poo_db(database_url)
+        command.stamp(alembic_config, POO_BASELINE_REVISION)
+        return "adopted"
+
+    database_path.parent.mkdir(parents=True, exist_ok=True)
+    command.upgrade(alembic_config, "head")
+    return "initialized"
+
+
+def main() -> None:
+    settings = get_settings()
+    result = adopt_or_initialize_poo_db(settings.poo_database_url)
+    if result == "initialized":
+        print("Initialized a new poo DB via Alembic upgrade head.")
+    elif result == "already_managed":
+        print("Poo DB is already Alembic-managed at the expected baseline revision.")
+    else:
+        print("Validated legacy poo DB and stamped Alembic baseline successfully.")
+
+
+if __name__ == "__main__":
+    main()