adding backup and data perstance accross devices

server/db.js

@@ -0,0 +1,100 @@
+import Database from 'better-sqlite3';
+import { mkdirSync } from 'fs';
+import { join, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const DATA_DIR = process.env.DATA_DIR || join(__dirname, 'data');
+const DB_PATH = join(DATA_DIR, 'projects.db');
+
+let db;
+
+// ---------------------------------------------------------------------------
+// Init — create tables if they don't exist
+// ---------------------------------------------------------------------------
+export function initDb() {
+  mkdirSync(DATA_DIR, { recursive: true });
+  db = new Database(DB_PATH);
+
+  // Enable WAL for better concurrent read performance
+  db.pragma('journal_mode = WAL');
+
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS projects (
+      id          TEXT PRIMARY KEY,
+      title       TEXT NOT NULL,
+      last_edited INTEGER NOT NULL,
+      chapter_summary TEXT,
+      data        TEXT NOT NULL
+    );
+  `);
+
+  console.log(`SQLite database ready at ${DB_PATH}`);
+}
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+function buildSummary(project) {
+  if (!Array.isArray(project.chapters)) return '';
+  return project.chapters.map((ch) => `${ch.book} ${ch.chapter}`).join(', ');
+}
+
+// ---------------------------------------------------------------------------
+// Queries
+// ---------------------------------------------------------------------------
+
+/**
+ * Returns all project summaries (id, title, lastEdited, chapterSummary).
+ * Does NOT return full project data to keep the response small.
+ */
+export function getAllProjects() {
+  const rows = db.prepare(`
+    SELECT id, title, last_edited AS lastEdited, chapter_summary AS chapterSummary
+    FROM projects
+    ORDER BY last_edited DESC
+  `).all();
+  return rows;
+}
+
+/**
+ * Returns a single full project by id, or null if not found.
+ */
+export function getProject(id) {
+  const row = db.prepare('SELECT data FROM projects WHERE id = ?').get(id);
+  if (!row) return null;
+  try {
+    return JSON.parse(row.data);
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Insert or replace a project. Returns the summary.
+ */
+export function upsertProject(project) {
+  const lastEdited = project.lastEdited ?? Date.now();
+  const chapterSummary = buildSummary(project);
+  const updated = { ...project, lastEdited };
+
+  db.prepare(`
+    INSERT INTO projects (id, title, last_edited, chapter_summary, data)
+    VALUES (?, ?, ?, ?, ?)
+    ON CONFLICT(id) DO UPDATE SET
+      title           = excluded.title,
+      last_edited     = excluded.last_edited,
+      chapter_summary = excluded.chapter_summary,
+      data            = excluded.data
+  `).run(project.id, project.title, lastEdited, chapterSummary, JSON.stringify(updated));
+
+  return { id: project.id, title: project.title, lastEdited, chapterSummary };
+}
+
+/**
+ * Delete a project by id. No-op if not found.
+ */
+export function deleteProject(id) {
+  db.prepare('DELETE FROM projects WHERE id = ?').run(id);
+}