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Goal: Minimize the disk footprint of Ren'Py save games for a low‑traffic visual novel by controlling how much data is stored in the persistent object across playthroughs. Constraint: The engine documentation does not expose a direct setting to cap the size of persistent data or to automatically prune old entries, yet the cautions note that uncontrolled growt
The Persistent library uses runMigration to synchronize database state with schema definitions written in its Haskell DSL. Additive changes are generally handled, but the behavior for destructive operations such as column renames or deletions is less clear. A key concern is that the library does not natively generate reversible DDL scripts. When a column is
Persistent Write Retry Logic Ren'Py’s save system uses renpy.storage.safe_write to protect persistent data from transient I/O failures. The function retries the write operation up to a hard‑coded limit before raising an IOError . While the retry loop avoids re‑serializing the data, the documentation does not state that the operation is atomic or that duplica
A Haskell service using the persistent library needs to page through a table that can grow to millions of rows. The straightforward approach — selectList with LimitTo and OffsetBy , which maps to SQL LIMIT / OFFSET — has two drawbacks at scale: the database still reads and discards every row preceding the offset, and rows inserted or deleted between requests
renpy
haskell