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- Custom Next.js server starts MQTT listener on boot - Subscribes to zigbee2mqtt/Bodenfeuchte_1, stores soil_moisture in SQLite - API route /api/data returns last 6 hours of measurements - Frontend shows current value + Recharts line chart, auto-refresh every 60s - Dockerfile + docker-compose with persistent volume for SQLite DB Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
38 lines
1.1 KiB
TypeScript
38 lines
1.1 KiB
TypeScript
import Database from 'better-sqlite3';
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import path from 'path';
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const DB_PATH = path.join(process.cwd(), 'data', 'bodenfeuchte.db');
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let db: Database.Database;
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export function getDb(): Database.Database {
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if (!db) {
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db = new Database(DB_PATH);
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db.exec(`
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CREATE TABLE IF NOT EXISTS measurements (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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timestamp INTEGER NOT NULL,
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soil_moisture REAL NOT NULL
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);
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CREATE INDEX IF NOT EXISTS idx_timestamp ON measurements(timestamp);
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`);
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}
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return db;
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}
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export function insertMeasurement(soilMoisture: number): void {
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const stmt = getDb().prepare(
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'INSERT INTO measurements (timestamp, soil_moisture) VALUES (?, ?)'
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);
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stmt.run(Date.now(), soilMoisture);
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}
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export function getLast6Hours(): { timestamp: number; soil_moisture: number }[] {
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const since = Date.now() - 6 * 60 * 60 * 1000;
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return getDb()
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.prepare(
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'SELECT timestamp, soil_moisture FROM measurements WHERE timestamp >= ? ORDER BY timestamp ASC'
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)
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.all(since) as { timestamp: number; soil_moisture: number }[];
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}
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