Add telemetry API and ingestion support (#205)

* Add telemetry ingestion and API support

* Flatten telemetry storage and API responses

* Fix telemetry insert placeholder count

* Adjust telemetry node updates

* run black

* run rufo

data/telemetry.sql

@@ -0,0 +1,43 @@
+-- Copyright (C) 2025 l5yth
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+CREATE TABLE IF NOT EXISTS telemetry (
+    id                      INTEGER PRIMARY KEY,
+    node_id                 TEXT,
+    node_num                INTEGER,
+    from_id                 TEXT,
+    to_id                   TEXT,
+    rx_time                 INTEGER NOT NULL,
+    rx_iso                  TEXT NOT NULL,
+    telemetry_time          INTEGER,
+    channel                 INTEGER,
+    portnum                 TEXT,
+    hop_limit               INTEGER,
+    snr                     REAL,
+    rssi                    INTEGER,
+    bitfield                INTEGER,
+    payload_b64             TEXT,
+    battery_level           REAL,
+    voltage                 REAL,
+    channel_utilization     REAL,
+    air_util_tx             REAL,
+    uptime_seconds          INTEGER,
+    temperature             REAL,
+    relative_humidity       REAL,
+    barometric_pressure     REAL
+);
+
+CREATE INDEX IF NOT EXISTS idx_telemetry_rx_time ON telemetry(rx_time);
+CREATE INDEX IF NOT EXISTS idx_telemetry_node_id ON telemetry(node_id);
+CREATE INDEX IF NOT EXISTS idx_telemetry_time ON telemetry(telemetry_time);