Export/Import improvements:
- Replace pagination with direct SQL query (db_sqlite_get_all_chat)
- Wrap import in SQL transaction with rollback on error
- Add fsync before fclose in export for data safety
- Sort merged output by timestamp with secondary key (stanza_id, from_jid)
- Export archive_id and marked_read from SQLite (lossless migration)
- Add progress indication every 500 messages during write/import
- Expand dedup key body prefix from 64 to 256 chars
- Fix g_slist_append O(n²) → g_slist_prepend + g_slist_reverse O(n)
Field parity (to_jid, to_resource, marked_read):
- Add fields to ff_parsed_line_t struct
- Write/parse to:|to_res:|read: metadata tags in flatfile format
- Pass to_resource through _ff_add_message and all callers
- Add marked_read to ProfMessage struct with -1 default (unset)
- Preserve fields across export/import round-trips
Tests (19 new: 11 unit + 8 functional):
- Unit: to_jid_and_marked_read, bracket_in_stanza_id, backslash_in_resource,
mucpm_type, all_enc_types, crlf_handling, to_jid_special_chars,
multiple_lines, parsed_line_free_null_safe, no_space_rejected,
unclosed_bracket
- Functional: export_idempotent_no_duplicates, export_lmc_correction_survives,
switch_preserves_old_backend_data, export_all_contacts,
import_double_dedup, verify_after_export,
switch_backends_independent_messages, export_empty_contact
- Rebalance test groups: move Chat Session from Group 3 to Group 4
(25/33/30/27 instead of 25/33/36/21)
- Remove hardcoded test counts from group comments
Man page:
- Document /history switch sqlite|flatfile
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