feat(checkers): add timestamp_without_tz#18
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Flags columns typed as 'timestamp' (without time zone). The non-tz variant stores wall-clock digits with no timezone awareness; values written from different timezones merge incorrectly, DST transitions corrupt local times, and timezone changes don't migrate the data. timestamptz is what teams almost always want. Severity: warning. The cost is real and accumulates (silent timezone bugs surface at DST or on a server move), but the schema isn't currently broken — fits warning per docs/severity.md. Tests cover: clean (timestamptz), positive (timestamp), mixed (only the timestamp column flagged), dropped column ignored. 16/16 against PG 10/13/15/17.
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Flags columns typed as 'timestamp' (without time zone). The non-tz variant stores wall-clock digits with no timezone awareness; values written from different timezones merge incorrectly, DST transitions corrupt local times, and timezone changes don't migrate the data. timestamptz is what teams almost always want.
Severity: warning. The cost is real and accumulates (silent timezone bugs surface at DST or on a server move), but the schema isn't currently broken — fits warning per docs/severity.md.
Tests cover: clean (timestamptz), positive (timestamp), mixed (only the timestamp column flagged), dropped column ignored. 16/16 against PG 10/13/15/17.