Never return negative bump stamp #3319

Job	Run time
changes	2s
lint-newsfile	33s
check-lockfile	4s
lint-crlf	4s
lint	23s
check-sampleconfig	41s
Typechecking	1m 18s
check-schema-delta	42s
lint-pydantic	42s
lint-clippy	0s
lint-clippy-nightly	0s
lint-readme	0s
lint-rustfmt	0s
linting-done	3s
calculate-test-jobs	7s
portdb (3.8, 11)	3m 16s
complement (monolith, SQLite)	13m 14s
trial-olddeps	8m 18s
portdb (3.11, 15)	3m 0s
complement (monolith, Postgres)	13m 59s
complement (workers, Postgres)	21m 33s
cargo-bench	0s
cargo-test	0s
trial-pypy	0s
trial (3.8, sqlite, all)	5m 54s
sytest (focal)	8m 44s
trial (3.8, postgres, 11, all)	13m 49s
sytest (focal, postgres)	10m 34s
trial (3.8, sqlite)	5m 29s
sytest (focal, multi-postgres, workers)	13m 48s
sytest (focal, multi-postgres, workers, asyncio)	19m 11s
export-data	2m 16s
tests-done	4s
	2h 27m 48s

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