···11+CREATE TABLE pings (
22+ id INTEGER PRIMARY KEY AUTOINCREMENT,
33+ service_id TEXT NOT NULL,
44+ timestamp INTEGER NOT NULL,
55+ status TEXT NOT NULL CHECK (status IN ('up', 'degraded', 'down')),
66+ latency_ms INTEGER
77+);
88+99+CREATE INDEX idx_pings_service_ts ON pings (service_id, timestamp DESC);