feat: Phase 0 mobile app scaffold — Expo 55, SQLite, Feed/Import/Settings screens

mobile/db/index.ts

@@ -0,0 +1,26 @@
+import type { SQLiteDatabase } from 'expo-sqlite';
+
+export async function migrateDb(db: SQLiteDatabase): Promise<void> {
+  await db.execAsync('PRAGMA journal_mode = WAL;');
+  await db.execAsync(`
+    CREATE TABLE IF NOT EXISTS activities (
+      id              TEXT PRIMARY KEY,
+      source_hash     TEXT NOT NULL,
+      detail_json     TEXT NOT NULL,
+      timeseries_json TEXT,
+      geojson         TEXT,
+      original_path   TEXT,
+      synced_at       INTEGER,
+      origin          TEXT NOT NULL CHECK(origin IN ('local', 'remote')),
+      created_at      INTEGER NOT NULL DEFAULT (unixepoch())
+    );
+
+    CREATE INDEX IF NOT EXISTS idx_activities_created_at
+      ON activities(created_at DESC);
+
+    CREATE TABLE IF NOT EXISTS settings (
+      key   TEXT PRIMARY KEY,
+      value TEXT NOT NULL
+    );
+  `);
+}

mobile/db/queries.ts

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+import { useSQLiteContext } from 'expo-sqlite';
+
+// ── Types ──────────────────────────────────────────────────────────────────
+
+export type ActivityRow = {
+  id: string;
+  source_hash: string;
+  detail_json: string;
+  timeseries_json: string | null;
+  geojson: string | null;
+  original_path: string | null;
+  synced_at: number | null;
+  origin: 'local' | 'remote';
+  created_at: number;
+};
+
+export type ActivitySummary = {
+  id: string;
+  title: string;
+  sport: string;
+  started_at: string;
+  distance_m: number | null;
+  duration_s: number | null;
+  elevation_gain_m: number | null;
+  origin: 'local' | 'remote';
+  synced_at: number | null;
+};
+
+// ── Activities ─────────────────────────────────────────────────────────────
+
+export function useActivities(): ActivitySummary[] {
+  const db = useSQLiteContext();
+  // Summaries are derived from the stored detail_json at query time.
+  // JSON extraction via SQLite's json_extract keeps the table schema simple.
+  const rows = db.getAllSync<{
+    id: string;
+    origin: 'local' | 'remote';
+    synced_at: number | null;
+    title: string;
+    sport: string;
+    started_at: string;
+    distance_m: number | null;
+    duration_s: number | null;
+    elevation_gain_m: number | null;
+  }>(`
+    SELECT
+      id, origin, synced_at,
+      json_extract(detail_json, '$.title')            AS title,
+      json_extract(detail_json, '$.sport')            AS sport,
+      json_extract(detail_json, '$.started_at')       AS started_at,
+      json_extract(detail_json, '$.distance_m')       AS distance_m,
+      json_extract(detail_json, '$.duration_s')       AS duration_s,
+      json_extract(detail_json, '$.elevation_gain_m') AS elevation_gain_m
+    FROM activities
+    ORDER BY created_at DESC
+  `);
+  return rows;
+}
+
+export function useActivity(id: string): ActivityRow | null {
+  const db = useSQLiteContext();
+  return db.getFirstSync<ActivityRow>(
+    'SELECT * FROM activities WHERE id = ?',
+    [id],
+  ) ?? null;
+}
+
+export async function insertActivity(
+  db: ReturnType<typeof useSQLiteContext>,
+  row: Pick<ActivityRow, 'id' | 'source_hash' | 'detail_json' | 'timeseries_json' | 'geojson' | 'original_path' | 'origin'>,
+): Promise<void> {
+  await db.runAsync(
+    `INSERT OR IGNORE INTO activities
+       (id, source_hash, detail_json, timeseries_json, geojson, original_path, origin)
+     VALUES (?, ?, ?, ?, ?, ?, ?)`,
+    [
+      row.id,
+      row.source_hash,
+      row.detail_json,
+      row.timeseries_json ?? null,
+      row.geojson ?? null,
+      row.original_path ?? null,
+      row.origin,
+    ],
+  );
+}
+
+// ── Settings ───────────────────────────────────────────────────────────────
+
+export async function getSetting(
+  db: ReturnType<typeof useSQLiteContext>,
+  key: string,
+): Promise<string | null> {
+  const row = db.getFirstSync<{ value: string }>(
+    'SELECT value FROM settings WHERE key = ?',
+    [key],
+  );
+  return row?.value ?? null;
+}
+
+export async function setSetting(
+  db: ReturnType<typeof useSQLiteContext>,
+  key: string,
+  value: string,
+): Promise<void> {
+  await db.runAsync(
+    `INSERT INTO settings (key, value) VALUES (?, ?)
+     ON CONFLICT(key) DO UPDATE SET value = excluded.value`,
+    [key, value],
+  );
+}
+
+export function useSetting(key: string): string | null {
+  const db = useSQLiteContext();
+  const row = db.getFirstSync<{ value: string }>(
+    'SELECT value FROM settings WHERE key = ?',
+    [key],
+  );
+  return row?.value ?? null;
+}