"""Migration 2026-05-09d: source_health_history (Verlauf der Health-Checks).

Bislang wurde vor jedem Health-Check-Run die Tabelle source_health_checks geleert
(DELETE FROM source_health_checks). Damit ging die Historie verloren - kein
Trend, keine Vergleichsmöglichkeit über Runs.

Diese Migration legt eine reine Append-Tabelle source_health_history an.
Vor jedem Health-Check-Run wird der aktuelle Stand von source_health_checks
hier archiviert (mit run_id und archived_at).

Ausführung:
    DB_PATH=/home/claude-dev/osint-data/osint.db python3 migrations/2026-05-09d_source_health_history.py
    DB_PATH=/home/claude-dev/AegisSight-Monitor-staging/data/osint.db python3 migrations/2026-05-09d_source_health_history.py
"""
import os
import sqlite3
import sys


def main(db_path: str) -> int:
    if not os.path.exists(db_path):
        print(f"FEHLER: DB nicht gefunden: {db_path}", file=sys.stderr)
        return 1

    conn = sqlite3.connect(db_path, timeout=60)
    conn.execute("PRAGMA busy_timeout = 60000")
    conn.execute("PRAGMA journal_mode = WAL")

    print(f"Migration auf {db_path}")

    conn.executescript("""
    CREATE TABLE IF NOT EXISTS source_health_history (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        run_id TEXT NOT NULL,
        source_id INTEGER NOT NULL,
        check_type TEXT NOT NULL,
        status TEXT NOT NULL,
        message TEXT,
        details TEXT,
        checked_at TIMESTAMP,
        archived_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    );
    CREATE INDEX IF NOT EXISTS idx_source_health_history_run ON source_health_history(run_id);
    CREATE INDEX IF NOT EXISTS idx_source_health_history_source ON source_health_history(source_id, archived_at DESC);
    CREATE INDEX IF NOT EXISTS idx_source_health_history_status ON source_health_history(status, archived_at DESC);
    """)
    print("  + source_health_history + Indizes (idempotent)")

    conn.commit()
    conn.close()
    print("Migration abgeschlossen.")
    return 0


if __name__ == "__main__":
    db_path = os.environ.get("DB_PATH", "/home/claude-dev/osint-data/osint.db")
    sys.exit(main(db_path))