Build system:
- Add --without-sqlite configure flag (AM_CONDITIONAL BUILD_SQLITE)
- Guard database_sqlite.c with HAVE_SQLITE in Makefile.am, database.c,
database.h and stub_database.c
- Fall back to flatfile when SQLite not compiled in
Security (database_flatfile.c):
- MAM dedup: skip incoming messages with duplicate stanza-id (archive_id)
- LMC sender validation: reject corrections from mismatched JIDs
- Add flock() advisory locking to prevent interleaved writes from
concurrent instances
- Check fprintf return when writing file header
Autocomplete (cmd_ac.c):
- Add 'flatfile' to /privacy logging autocomplete
- Add dedicated /history autocomplete with on/off/verify (was boolean-only)
Code quality:
- Fix fwrite return type: size_t not ssize_t (database_flatfile_parser.c)
- Fix mixed allocators in ff_readline: use malloc() consistently for
overlength-line fallback instead of g_strdup()
- Fix index alignment in _ff_state_extend: use local counter so index
step doesn't depend on total_lines from initial build
Documentation:
- Fix page: correct directory structure (history.log not per-day files)
- Fix page: add aid:{archive_id} to line format example
- Fix page: missing newline before .SH BUGS
Replace per-contact directory structure with a single flat file per contact.
Each file uses pipe-delimited records with a sparse byte-offset index
that is rebuilt on demand and cached in memory.
- Rewrite _ff_write_record / _ff_read_records for single-file format
- Add sparse index (every Nth record) for O(log N) seek on history read
- Cursor-based pagination: _ff_get_previous_chat uses saved byte offset
- LMC corrections applied in-place during read (_ff_apply_lmc)
- Newline escaping (\n) in message bodies for line-based storage
- Simplify verify: parse + timestamp order + LMC reference check
- Update parser helpers for new field layout
