db restore with create db if not exitst

modules/system/databaseMigration.py

@@ -545,6 +545,74 @@ def _prepareImport(payload: dict) -> dict:
     }
 
 
+def _ensureDatabaseExists(dbName: str) -> bool:
+    """Create the PostgreSQL database if it does not yet exist.
+
+    Connects to the ``postgres`` admin database using the same credentials
+    as the target DB.  Returns True if the database was created, False if
+    it already existed.
+    """
+    registeredDbs = getRegisteredDatabases()
+    configPrefix = registeredDbs.get(dbName)
+    if configPrefix is None:
+        return False
+
+    hostKey = f"{configPrefix}_HOST" if configPrefix != "DB" else "DB_HOST"
+    portKey = f"{configPrefix}_PORT" if configPrefix != "DB" else "DB_PORT"
+    userKey = f"{configPrefix}_USER" if configPrefix != "DB" else "DB_USER"
+    passwordKey = f"{configPrefix}_PASSWORD_SECRET" if configPrefix != "DB" else "DB_PASSWORD_SECRET"
+
+    adminConn = psycopg2.connect(
+        host=APP_CONFIG.get(hostKey, "localhost"),
+        port=int(APP_CONFIG.get(portKey, 5432)),
+        database="postgres",
+        user=APP_CONFIG.get(userKey),
+        password=APP_CONFIG.get(passwordKey),
+        client_encoding="utf8",
+    )
+    try:
+        adminConn.autocommit = True
+        with adminConn.cursor() as cur:
+            cur.execute("SELECT 1 FROM pg_database WHERE datname = %s", (dbName,))
+            if cur.fetchone():
+                return False
+            cur.execute(f'CREATE DATABASE "{dbName}"')
+            logger.info("Created missing database: %s", dbName)
+            return True
+    finally:
+        adminConn.close()
+
+
+def _createTableFromExport(conn, tableName: str, rows: List[dict]) -> None:
+    """Create a table based on the column structure found in the export data.
+
+    Uses TEXT for all columns since we don't have the original DDL.
+    The ``id`` column gets a PRIMARY KEY constraint.
+    """
+    allKeys: List[str] = []
+    seen: set = set()
+    for row in rows:
+        for k in row.keys():
+            if k not in seen:
+                allKeys.append(k)
+                seen.add(k)
+
+    if not allKeys:
+        return
+
+    colDefs = []
+    for col in allKeys:
+        if col == "id":
+            colDefs.append(f'"{col}" TEXT PRIMARY KEY')
+        else:
+            colDefs.append(f'"{col}" TEXT')
+
+    ddl = f'CREATE TABLE IF NOT EXISTS "{tableName}" ({", ".join(colDefs)})'
+    with conn.cursor() as cur:
+        cur.execute(ddl)
+    logger.info("Created table %s with %d columns", tableName, len(allKeys))
+
+
 def _importSingleDb(payload: dict, dbName: str, mode: str, protectedIds: List[str]) -> dict:
     """Import a single database from the (already remapped) payload.
 
@@ -563,11 +631,21 @@ def _importSingleDb(payload: dict, dbName: str, mode: str, protectedIds: List[st
         return {"database": dbName, "tables": {}, "recordCount": 0,
                 "warnings": [f"Keine Daten fuer '{dbName}' im Payload"]}
 
+    try:
+        dbCreated = _ensureDatabaseExists(dbName)
+    except Exception as e:
+        logger.error("Failed to ensure database %s exists: %s", dbName, e)
+        return {"database": dbName, "tables": {}, "recordCount": 0,
+                "warnings": [f"Datenbank '{dbName}' konnte nicht erstellt werden: {e}"]}
+
     protectedIdSet = set(protectedIds)
     tables = dbData.get("tables", {})
     warnings: List[str] = []
     dbResult: Dict[str, int] = {}
 
+    if dbCreated:
+        warnings.append(f"Datenbank '{dbName}' wurde neu erstellt")
+
     conn = _getConnection(dbName)
     try:
         conn.autocommit = False
@@ -576,9 +654,11 @@ def _importSingleDb(payload: dict, dbName: str, mode: str, protectedIds: List[st
         for tableName, rows in tables.items():
             if not isinstance(rows, list):
                 continue
+
             if tableName not in existingTables:
-                warnings.append(f"Tabelle '{dbName}.{tableName}' existiert nicht, uebersprungen")
-                continue
+                _createTableFromExport(conn, tableName, rows)
+                conn.commit()
+                conn.autocommit = False
 
             physicalCols = _getPhysicalColumns(conn, tableName)
             if not physicalCols: