+image viewer, better dupes protection and background processing

shared/src/commonMain/kotlin/net/sergeych/toread/storage/LibraryStorage.kt

@@ -94,6 +94,7 @@ data class BookFileRecord(
     val bookId: String? = null,
     val bodyId: String? = null,
     val bodyClusterId: String? = null,
+    val duplicateOfFileId: String? = null,
     val rawSha256: String,
     val format: String? = null,
     val mimeType: String? = null,
@@ -194,6 +195,10 @@ interface BookFileRepository {
     fun get(id: String): BookFileRecord?
     fun getLibraryFile(id: String): LibraryFileRecord?
     fun findByRawSha256(rawSha256: String): List<BookFileRecord>
+    fun findByOriginalFilenameSizeAndModified(originalFilename: String, sizeBytes: Long, lastModifiedMillis: Long): List<BookFileRecord>
+    fun findByOriginalFilenameSizeAndRawSha256(originalFilename: String, sizeBytes: Long, rawSha256: String): List<BookFileRecord>
+    fun findPrimaryDuplicateTarget(bodyClusterId: String?, bodyId: String?, rawSha256: String): BookFileRecord?
+    fun markDuplicateFiles(): Int
     fun listLibraryFiles(limit: Int = 100, offset: Int = 0): List<LibraryFileRecord>
     fun list(limit: Int = 500, offset: Int = 0): List<BookFileRecord>
     fun listForBook(bookId: String): List<BookFileRecord>