fix(db): fall back to JSON store when HyperDB has no users

HyperDB Rocks was opening empty on ~/.config/pearcord while registered
users lived only in pearcord-db.json, so session restore showed onboarding
despite a valid keypair and marker. If HyperDB has zero users but JSON has
rows, close Rocks and use JsonStore for that storage path.

Co-authored-by: Cursor <[email protected]>

index.js

@@ -22,6 +22,35 @@ function tryLoadHyperDB () {
 }
 
 const hasHyperDB = tryLoadHyperDB()
+const USERS_COLLECTION = '@pearcord/users'
+
+function jsonStoreHasUsers (storagePath) {
+  const file = path.join(storagePath, 'pearcord-db.json')
+  if (!fs.existsSync(file)) return false
+  try {
+    const raw = JSON.parse(fs.readFileSync(file, 'utf8'))
+    const users = raw[USERS_COLLECTION]
+    return Array.isArray(users) && users.length > 0
+  } catch {
+    return false
+  }
+}
+
+async function hyperdbHasUsers (backend) {
+  try {
+    let rows = await backend.find(USERS_COLLECTION, {}, { limit: 1 })
+    if (rows && typeof rows.toArray === 'function') rows = await rows.toArray()
+    else if (rows && typeof rows[Symbol.asyncIterator] === 'function') {
+      const list = []
+      for await (const row of rows) list.push(row)
+      rows = list
+    }
+    return Array.isArray(rows) && rows.length > 0
+  } catch (err) {
+    if (/Unknown index|Unknown collection/.test(err.message)) return false
+    throw err
+  }
+}
 
 class LocalDatabase {
   constructor (storagePath) {
@@ -40,8 +69,17 @@ class LocalDatabase {
   async ready () {
     if (this.backend) return this.backend
     if (this.engine === 'hyperdb') {
-      this.backend = HyperDB.rocks(this.storagePath, def)
+      const rocks = HyperDB.rocks(this.storagePath, def)
+      await rocks.ready()
+      const hasUsers = await hyperdbHasUsers(rocks)
+      if (!hasUsers && jsonStoreHasUsers(this.storagePath)) {
+        await rocks.close()
+        this.engine = 'json'
+        this.backend = new JsonStore(this.storagePath)
         await this.backend.ready()
+        return this.backend
+      }
+      this.backend = rocks
     } else {
       this.backend = new JsonStore(this.storagePath)
       await this.backend.ready()
@@ -130,4 +168,4 @@ class LocalDatabase {
   }
 }
 
-module.exports = { LocalDatabase, hasHyperDB }
+module.exports = { LocalDatabase, hasHyperDB, jsonStoreHasUsers }