A DatabaseUpdate can now contain a List of create_query-Strings that are used if the database is to be created from scratch.

src/main/kotlin/de/fabianonline/telegram_backup/DatabaseUpdates.kt

@@ -41,7 +41,7 @@ class DatabaseUpdates(protected var conn: Connection, protected var db: Database
 			logger.debug("DatabaseUpdate.doUpdates running")
 
 			logger.debug("Getting current database version")
-			val version: Int
+			var version: Int
 			logger.debug("Checking if table database_versions exists")
 			rs = stmt.executeQuery("SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='database_versions'")
 			rs.next()
@@ -60,6 +60,26 @@ class DatabaseUpdates(protected var conn: Connection, protected var db: Database
 			System.out.println("Database version: " + version)
 			logger.debug("Max available database version is {}", maxPossibleVersion)
 
+			if (version == 0) {
+				logger.debug("Looking for DatabaseUpdate with create_query...")
+				// This is a fresh database - so we search for the latest available version with a create_query
+				// and use this as a shortcut.
+				var update: DatabaseUpdate? = null
+				for (i in maxPossibleVersion downTo 1) {
+					update = getUpdateToVersion(i)
+					logger.trace("Looking at DatabaseUpdate version {}", update.version)
+					if (update.create_query != null) break
+					update = null
+				}
+
+				if (update != null) {
+					logger.debug("Found DatabaseUpdate version {} with create_query.", update.version)
+					for (query in update.create_query!!) stmt.execute(query)
+					stmt.execute("INSERT INTO database_versions (version) VALUES (${update.version})")
+					version = update.version
+				}
+			}
+
 			if (version < maxPossibleVersion) {
 				logger.debug("Update is necessary. {} => {}.", version, maxPossibleVersion)
 				var backup = false
@@ -151,6 +171,8 @@ internal abstract class DatabaseUpdate(protected var conn: Connection, protected
 	companion object {
 		protected val logger = LoggerFactory.getLogger(DatabaseUpdate::class.java)
 	}
+
+	open val create_query: List<String>? = null
 }
 
 internal class DB_Update_1(conn: Connection, db: Database) : DatabaseUpdate(conn, db) {
@@ -376,6 +398,15 @@ internal class DB_Update_9(conn: Connection, db: Database) : DatabaseUpdate(conn
 	override val version: Int
 		get() = 9
 	override val needsBackup = true
+
+	override val create_query = listOf(
+		"CREATE TABLE \"chats\" (id INTEGER PRIMARY KEY ASC, name TEXT, type TEXT);",
+		"CREATE TABLE \"users\" (id INTEGER PRIMARY KEY ASC, first_name TEXT, last_name TEXT, username TEXT, type TEXT, phone TEXT);",
+		"CREATE TABLE database_versions (version INTEGER);",
+		"CREATE TABLE runs (id INTEGER PRIMARY KEY ASC, time INTEGER, start_id INTEGER, end_id INTEGER, count_missing INTEGER);",
+		"CREATE TABLE \"messages\" (id INTEGER PRIMARY KEY AUTOINCREMENT,message_id INTEGER,message_type TEXT,source_type TEXT,source_id INTEGER,sender_id INTEGER,fwd_from_id INTEGER,text TEXT,time INTEGER,has_media BOOLEAN,media_type TEXT,media_file TEXT,media_size INTEGER,media_json TEXT,markup_json TEXT,data BLOB,api_layer INTEGER);",
+		"CREATE UNIQUE INDEX unique_messages ON messages (source_type, source_id, message_id);"
+	)
 	
 	@Throws(SQLException::class)
 	override fun _doUpdate() {