SQLite schema and first-run seeding

server/src/db.js

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+import Database from 'better-sqlite3';
+import bcrypt from 'bcryptjs';
+import fs from 'node:fs';
+import path from 'node:path';
+
+const DATA_DIR = process.env.DATA_DIR || path.join(process.cwd(), 'data');
+fs.mkdirSync(DATA_DIR, { recursive: true });
+
+const db = new Database(path.join(DATA_DIR, 'dispatch.db'));
+db.pragma('journal_mode = WAL');
+db.pragma('foreign_keys = ON');
+
+db.exec(`
+CREATE TABLE IF NOT EXISTS users (
+  id            INTEGER PRIMARY KEY AUTOINCREMENT,
+  username      TEXT UNIQUE NOT NULL,
+  password_hash TEXT NOT NULL,
+  role          TEXT NOT NULL DEFAULT 'dispatcher',
+  created_at    INTEGER NOT NULL
+);
+CREATE TABLE IF NOT EXISTS talkgroups (
+  id    INTEGER PRIMARY KEY AUTOINCREMENT,
+  name  TEXT UNIQUE NOT NULL,
+  color TEXT NOT NULL DEFAULT '#3b82f6'
+);
+CREATE TABLE IF NOT EXISTS members (
+  id        INTEGER PRIMARY KEY AUTOINCREMENT,
+  name      TEXT NOT NULL,
+  callsign  TEXT,
+  device_id TEXT UNIQUE,
+  group_id  INTEGER REFERENCES talkgroups(id),
+  status    TEXT NOT NULL DEFAULT 'offline',
+  battery   INTEGER,
+  lat       REAL,
+  lng       REAL,
+  last_seen INTEGER
+);
+CREATE TABLE IF NOT EXISTS gps_pings (
+  id        INTEGER PRIMARY KEY AUTOINCREMENT,
+  member_id INTEGER NOT NULL REFERENCES members(id) ON DELETE CASCADE,
+  lat       REAL NOT NULL,
+  lng       REAL NOT NULL,
+  speed     REAL,
+  ts        INTEGER NOT NULL
+);
+CREATE INDEX IF NOT EXISTS idx_pings_member_ts ON gps_pings(member_id, ts);
+CREATE TABLE IF NOT EXISTS sos_alerts (
+  id         INTEGER PRIMARY KEY AUTOINCREMENT,
+  member_id  INTEGER NOT NULL REFERENCES members(id),
+  lat        REAL,
+  lng        REAL,
+  state      TEXT NOT NULL DEFAULT 'open',   -- open | ack | resolved
+  ack_by     TEXT,
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER
+);
+CREATE TABLE IF NOT EXISTS call_log (
+  id        INTEGER PRIMARY KEY AUTOINCREMENT,
+  group_id  INTEGER NOT NULL REFERENCES talkgroups(id),
+  member_id INTEGER,
+  kind      TEXT NOT NULL,                  -- ptt_start | ptt_stop
+  ts        INTEGER NOT NULL
+);
+`);
+
+// ---- first-run seed -------------------------------------------------------
+const hasAdmin = db.prepare('SELECT 1 FROM users WHERE username = ?').get('admin');
+if (!hasAdmin) {
+  db.prepare('INSERT INTO users (username, password_hash, role, created_at) VALUES (?, ?, ?, ?)')
+    .run('admin', bcrypt.hashSync(process.env.ADMIN_PASSWORD || 'admin', 10), 'admin', Date.now());
+  console.log('[db] created default dispatcher "admin" (password: admin) — change it');
+}
+
+const groupCount = db.prepare('SELECT COUNT(*) AS n FROM talkgroups').get().n;
+if (groupCount === 0) {
+  const ins = db.prepare('INSERT INTO talkgroups (name, color) VALUES (?, ?)');
+  ins.run('Alpha', '#3b82f6');
+  ins.run('Bravo', '#f59e0b');
+  ins.run('Echo', '#10b981');
+  console.log('[db] seeded default talkgroups: Alpha, Bravo, Echo');
+}
+
+export default db;