HB, OTA etc

db/migrations/V2__telemetry_data.sql

@@ -0,0 +1,20 @@
+CREATE TABLE telemetry_data (
+    id BIGINT AUTO_INCREMENT PRIMARY KEY,
+
+    device_id BIGINT NOT NULL,
+    ts BIGINT NOT NULL,
+
+    metric VARCHAR(32) NOT NULL,
+    source VARCHAR(64) NOT NULL,
+
+    value DOUBLE NOT NULL,
+
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+
+    INDEX idx_device_metric_ts (device_id, metric, ts),
+    INDEX idx_ts (ts),
+
+    FOREIGN KEY (device_id) REFERENCES devices(id)
+);
+
+CREATE INDEX idx_processed ON telemetry(processed);