SQLite AUTOINCREMENT keeps a high-water mark in sqlite_sequence that
deleting rows never lowers, so after removing inbounds the next add kept
climbing instead of reusing freed ids. DelInbound now realigns the
counter to MAX(id) after each delete, clearing the sqlite_sequence row
entirely when the table is empty so the next inbound starts at id 1.
Guarded behind !IsPostgres(); Postgres sequences are left untouched.
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