feat: improve initial load performance on mobile (#2126)

packages/mobile/src/Lib/Database/FlashKeyValueStore.ts

@@ -0,0 +1,40 @@
+import { MMKV } from 'react-native-mmkv'
+
+export class FlashKeyValueStore {
+  private storage: MMKV
+
+  constructor(identifier: string) {
+    this.storage = new MMKV({ id: identifier })
+  }
+
+  set(key: string, value: unknown): void {
+    this.storage.set(key, JSON.stringify(value))
+  }
+
+  delete(key: string): void {
+    this.storage.delete(key)
+  }
+
+  deleteAll(): void {
+    this.storage.clearAll()
+  }
+
+  getAllKeys(): string[] {
+    return this.storage.getAllKeys()
+  }
+
+  get<T>(key: string): T | undefined {
+    const item = this.storage.getString(key)
+    if (item) {
+      try {
+        return JSON.parse(item)
+      } catch (e) {
+        return item as T
+      }
+    }
+  }
+
+  multiGet<T>(keys: string[]): (T | undefined)[] {
+    return keys.map((key) => this.get<T>(key))
+  }
+}