Custom character stat storing

[PlayJeri]

General description

Problem

Currently custom character stats are stored as absolute values instead of deltas from base stats.

Current behavior

• Each character document contains stats like hp, attack, shield, speed.
• These stats are stored as numeric levels
• Every character has predefined base stat levels.
• When a character is created, the base stat levels are saved directly in DB.
• When player levels up a character, the updated stat levels overwrite these values in the DB.

Issue

Because the database stores final stat levels, we lost the distinction between:

• base stats defined by game balance
• stats gained through player progression

If we later need to balance a character base stats:

• We don't know which portion of the stored values comes from the base stats vs. player level-ups.
• Updating base stats would require complex migrations or would risk breaking player progression.

Solution

Store stat level-ups as deltas from base stats.
Instead of storing absolute stat levels in the database, store only the level-up amounts (deltas) relative to the character's base stats. Then end points that return the custom character stats / levels you return the saved level-ups from db + the character base stats.

Tasks

• Check if the schemas / DTOs related to character stats need to be updated (documentation or code itself)
• Update service methods that return character stats to return base stats + stored level ups.