RJ's Session Stats

Fabric server mod that writes per-session stat deltas when players disconnect.

In addition to the vanilla statistics files, you get a per session (between join/leave) file for each player.

What it does

• Captures a stat snapshot on join and computes deltas on disconnect.
• Writes a JSON file per session under: world/stats/sessions/YYYY-MM-DD/.
• File names include start/end timestamps, player UUID, and player name.

Output format

Uses the vanilla stats JSON format, but values are deltas for the session.

Example file listing (one player)

$ find server-data/world/stats/

server-data2/world/stats/
server-data2/world/stats/5b2b1d3d-0d25-4086-bd3f-27328f30467c.json
server-data2/world/stats/sessions
server-data2/world/stats/sessions/2026-01-17
server-data2/world/stats/sessions/2026-01-17/2026-01-17T19-29-40Z_2026-01-17T19-48-56Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-17/2026-01-17T19-52-36Z_2026-01-17T19-55-20Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-17/2026-01-17T19-58-08Z_2026-01-17T19-58-33Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-17/2026-01-17T20-02-52Z_2026-01-17T20-02-57Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-17/2026-01-17T20-05-59Z_2026-01-17T20-06-08Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-19
server-data2/world/stats/sessions/2026-01-19/2026-01-19T14-20-36Z_2026-01-19T14-20-58Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-19/2026-01-19T14-31-19Z_2026-01-19T16-03-47Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-19/2026-01-19T16-04-43Z_2026-01-19T19-46-16Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-19/2026-01-19T19-46-27Z_2026-01-19T23-16-04Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
...