fix(library): book psn play on its last played day (#53)

A newly linked PSN title booked its whole history on the sync day.
Now only new play counts, on its last played day. A day is capped
at 24 h. V49 deletes the wrong old day rows.

readme.md

@@ -98,8 +98,8 @@ To Be Played is split into four repositories:
   of the rate limit; it stops after 3 Steam errors in a row or when Steam hides the achievements. A Steam error never
   overwrites stored data. Summary: unlocked total, perfect games, average completion over started games, the 5
   games closest to 100 %.
-- **Playtime history**: one row per game and day, for the activity view and the "most played in the last two weeks"
-  dashboard banner.
+- **Playtime history**: one row per game and day (a day counts at most 24 h in the stats and the chart), for the
+  activity view and the "most played in the last two weeks" dashboard banner.
 - **Finished from achievements or playtime**: `EndingAchievement` finds the one achievement of a game that means
   "story end" (English text rule, Steam's global unlock rate between 1 and 80 %, the easiest variant wins, more than
   3 candidates = a game without one end). When the user unlocks it, never chose the status and never answered
@@ -786,7 +786,9 @@ project ships it; all values in `app.psn.*`). `PsnAccountService` in `library` h
   - Every `LINKED` or `STEAM_OWNED` title also keeps its own platform, minutes and last played in `user_psn_title` (V44),
     so the detail shows PlayStation play next to Steam's on a shared row. The Steam row's own playtime stays Steam's.
   - A `LINKED` title updates its row (`source = PSN`, not removed): playtime, `last_played_at`, `PLAYTIME` changes and the
-    playtime history; `playtime_2weeks` is the sum of the history of the last 14 days. A game the user removed stays
+    playtime history; `playtime_2weeks` is the sum of the history of the last 14 days. The minutes a title grew since
+    its stored play are booked on its last played day (Berlin), only when its last played moved; a title linked in this
+    run is the start point and books nothing (V49 dropped the old wrong rows). A game the user removed stays
     `LINKED` and the sync does not add it again; its row stays removed, so the sync skips it until the user restores it:
     a restore takes the stored title play (`psn_title_play`) and the sync updates the row again. Flyway V46 gave games
     removed before (soft delete) a removed `PSN` row and turned a `MANUAL` row re-added on a `LINKED` key back to `PSN`. A game also owned on Steam stays one row (the Steam row wins).