A transfer row's active/compacted flags were read by truthiness, so a
hand-edited or foreign JSONL row with "active": "0" (truthy string) imported
live - putting compaction-archived turns back into model context - and
"active": null archived a live row. Coerce both flags with the same
_coerce_or(..., int, default) used for the int session columns: a missing,
null, or unparsable active flag means live (older exports carry none), and
compacted defaults to 0.
The same pass partitions rows into live and archived up front, replacing the
id()-set complement, the dead "_row_id" guard (_insert_message_rows always
sets it), and the subtract-and-reparse counter fixup: message_count and
tool_call_count now come straight from the live rows, with identical values
for well-formed exports. The kept round-trip test re-imports its payload with
stringified/null flags and asserts every row keeps its state.
Co-authored-by: John Paul Soliva <soliva.johnpaul@icloud.com>
deb7bc7343