Ubuntu / MySQL Database Crash

Hi

My database working for motnhs and crashed itself today... with error "Data Dictionary initialization failed." I can't start mysql.service anymore - anybody help please ?

There are logs from mysql after trying to start service:

2023-08-16T09:02:52.032346Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.34-0ubuntu0.22.04.1) starting as process 7397
2023-08-16T09:02:52.046210Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2023-08-16T09:02:52.084885Z 1 [ERROR] [MY-012209] [InnoDB] Multiple files found for the same tablespace ID:
2023-08-16T09:02:52.084960Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 193 = ['sys/traccar/DATABASECHANGELOG.ibd', 'traccar/DATABASECHANGELOG.ibd'] 
2023-08-16T09:02:52.084992Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 194 = ['sys/traccar/DATABASECHANGELOGLOCK.ibd', 'traccar/DATABASECHANGELOGLOCK.ibd'] 
2023-08-16T09:02:52.085008Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 195 = ['sys/traccar/tc_attributes.ibd', 'traccar/tc_attributes.ibd'] 
2023-08-16T09:02:52.085022Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 196 = ['sys/traccar/tc_calendars.ibd', 'traccar/tc_calendars.ibd'] 
2023-08-16T09:02:52.085036Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 197 = ['sys/traccar/tc_commands.ibd', 'traccar/tc_commands.ibd'] 
2023-08-16T09:02:52.085050Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 198 = ['sys/traccar/tc_device_attribute.ibd', 'traccar/tc_device_attribute.ibd'] 
2023-08-16T09:02:52.085064Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 199 = ['sys/traccar/tc_device_command.ibd', 'traccar/tc_device_command.ibd'] 
2023-08-16T09:02:52.085077Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 200 = ['sys/traccar/tc_device_driver.ibd', 'traccar/tc_device_driver.ibd'] 
2023-08-16T09:02:52.085091Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 201 = ['sys/traccar/tc_device_geofence.ibd', 'traccar/tc_device_geofence.ibd'] 
2023-08-16T09:02:52.085104Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 202 = ['sys/traccar/tc_device_maintenance.ibd', 'traccar/tc_device_maintenance.ibd'] 
2023-08-16T09:02:52.085118Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 203 = ['sys/traccar/tc_device_notification.ibd', 'traccar/tc_device_notification.ibd'] 
2023-08-16T09:02:52.085132Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 204 = ['sys/traccar/tc_device_order.ibd', 'traccar/tc_device_order.ibd'] 
2023-08-16T09:02:52.085151Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 205 = ['sys/traccar/tc_devices.ibd', 'traccar/tc_devices.ibd'] 
2023-08-16T09:02:52.085165Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 206 = ['sys/traccar/tc_drivers.ibd', 'traccar/tc_drivers.ibd'] 
2023-08-16T09:02:52.085178Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 207 = ['sys/traccar/tc_events.ibd', 'traccar/tc_events.ibd'] 
2023-08-16T09:02:52.085207Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 208 = ['sys/traccar/tc_geofences.ibd', 'traccar/tc_geofences.ibd'] 
2023-08-16T09:02:52.085221Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 209 = ['sys/traccar/tc_group_attribute.ibd', 'traccar/tc_group_attribute.ibd'] 
2023-08-16T09:02:52.085234Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 210 = ['sys/traccar/tc_group_command.ibd', 'traccar/tc_group_command.ibd'] 
2023-08-16T09:02:52.085248Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 211 = ['sys/traccar/tc_group_driver.ibd', 'traccar/tc_group_driver.ibd'] 
2023-08-16T09:02:52.085261Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 212 = ['sys/traccar/tc_group_geofence.ibd', 'traccar/tc_group_geofence.ibd'] 
2023-08-16T09:02:52.085274Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 213 = ['sys/traccar/tc_group_maintenance.ibd', 'traccar/tc_group_maintenance.ibd'] 
2023-08-16T09:02:52.085288Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 214 = ['sys/traccar/tc_group_notification.ibd', 'traccar/tc_group_notification.ibd'] 
2023-08-16T09:02:52.085301Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 215 = ['sys/traccar/tc_group_order.ibd', 'traccar/tc_group_order.ibd'] 
2023-08-16T09:02:52.085314Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 216 = ['sys/traccar/tc_groups.ibd', 'traccar/tc_groups.ibd'] 
2023-08-16T09:02:52.085327Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 217 = ['sys/traccar/tc_maintenances.ibd', 'traccar/tc_maintenances.ibd'] 
2023-08-16T09:02:52.085340Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 218 = ['sys/traccar/tc_notifications.ibd', 'traccar/tc_notifications.ibd'] 
2023-08-16T09:02:52.085354Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 219 = ['sys/traccar/tc_orders.ibd', 'traccar/tc_orders.ibd'] 
2023-08-16T09:02:52.085367Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 220 = ['sys/traccar/tc_positions.ibd', 'traccar/tc_positions.ibd'] 
2023-08-16T09:02:52.085402Z 1 [ERROR] [MY-012930] [InnoDB] Plugin initialization aborted with error Failed, retry may succeed.
2023-08-16T09:02:52.085441Z 1 [ERROR] [MY-010334] [Server] Failed to initialize DD Storage Engine
2023-08-16T09:02:52.085625Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2023-08-16T09:02:52.085687Z 0 [ERROR] [MY-010119] [Server] Aborting
2023-08-16T09:02:52.086807Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.34-0ubuntu0.22.04.1)  (Ubuntu).
2023-08-16T09:02:52.987000Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.34-0ubuntu0.22.04.1) starting as process 7408
2023-08-16T09:02:53.000447Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2023-08-16T09:02:53.039920Z 1 [ERROR] [MY-012209] [InnoDB] Multiple files found for the same tablespace ID:
2023-08-16T09:02:53.040005Z 1 [ERROR] [MY-012202] [InnoDB] Tablespace ID: 193 = ['sys/traccar/DATABASECHANGELOG.ibd', 'traccar/DATABASECHANGELOG.ibd'] 
...

Traccar Version: 5.6

Restore from backup?

Backup is the last resort. I solved the problem by deleting files from the sys/traccar/ location - but the question?

Where did they come from? and why did the problem occur suddenly when no work was done on the server???

Someone must have copied those files, but it's definitely not Traccar.