Migrate the PG telemetry fixtures to the 36-field recorder and add the
storage compatibility acceptance the plan calls for.
Mechanical migration:
- _EXPECTED_COLUMNS 27 -> 37 physical columns
- _record_minimal gains the ten keys in the same shape as the unit suite
- _PRE_TENANT_COLUMNS now excludes 14 columns, derived from
_CALL_OBSERVABILITY_COLUMNS instead of a second hand-written list, and
the two manual-mode warnings assert a notice derived from COLUMNS order
so a column that silently drops out of the warning turns the test red
New TestCallObservabilityColumnsAcceptance, all on a 27-column 1.3.4
shaped table built by the existing pg_sandbox factory:
- auto appends the ten columns in the same order as a fresh database and
old rows keep NULL in every one of them (no backfill, no sentinel)
- manual sends no DDL, trims the INSERT, and still round-trips the other
26 columns value by value
- an old-version writer using insert_sql with the 1.3.4 column set and a
new-version writer share one table, and event_kind filtering counts
neither the old rows as failures nor as successes
_minimal_fields is split out of _record_minimal so the simulated old
process reuses the same values rather than copying them.
Verified against the real lab Postgres: 30 passed.
iomgaa
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