Initial commit — SyncFlow Android file sync app

Supports WebDAV, SFTP, SFTPGo, Nextcloud, ownCloud, Google Drive,
Dropbox, and OneDrive. Credentials encrypted with Android Keystore.
Biometric app-lock, conflict resolution, and auto-sync via WorkManager.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/main/kotlin/com/syncflow/data/db/SyncFileStateDao.kt

@@ -0,0 +1,25 @@
+package com.syncflow.data.db
+
+import androidx.room.*
+import com.syncflow.data.db.entities.SyncFileStateEntity
+
+@Dao
+interface SyncFileStateDao {
+    @Query("SELECT * FROM sync_file_states WHERE syncPairId = :pairId")
+    suspend fun getForPair(pairId: Long): List<SyncFileStateEntity>
+
+    @Query("SELECT * FROM sync_file_states WHERE syncPairId = :pairId AND relativePath = :path")
+    suspend fun get(pairId: Long, path: String): SyncFileStateEntity?
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun upsert(entity: SyncFileStateEntity)
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun upsertAll(entities: List<SyncFileStateEntity>)
+
+    @Query("DELETE FROM sync_file_states WHERE syncPairId = :pairId AND relativePath = :path")
+    suspend fun delete(pairId: Long, path: String)
+
+    @Query("DELETE FROM sync_file_states WHERE syncPairId = :pairId")
+    suspend fun deleteForPair(pairId: Long)
+}