The default CacheBackingStore::push_all deleted every row and then pushed
one by one, so a failing push left the store emptied or partial while
put_prepared_batch claimed all-or-nothing. The default is deleted:
push_all is a required method documented as one atomic replace, and a
compile_fail doctest pins that a store without it does not compile.
Every in-tree implementor (single-file, both redb stores, the test store,
Epiphany's runtime store) already supplies its own.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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