Tables in this folder are optional and extend the dataset of the original datapack tables. Unless you have enabled custom data loading, it is not a problem when this tables are missing from the database.

Example:
custom_spawnlist extends spawnlist with additional spawns. When the spawnlist table is updated by the L2J-Team you won't have to worry about duplicate IDs or data loss.

Explanation of the tables in this folder:
custom_npc_buffer -> In this table, you can define additional npc buffer data.
custom_spawnlist -> In this table, you can define additional npc spawns. Usually this table is filled when using the //spawn admin command.
custom_teleport -> In this table, you can define additional teleport locations. 