SSS: Implement PREVIOUSLY room tracking #2573

Job	Run time
changes	4s
lint-crlf	4s
check-lockfile	8s
lint-newsfile	33s
check-sampleconfig	56s
lint	44s
check-schema-delta	38s
Typechecking	1m 22s
lint-pydantic	52s
lint-clippy-nightly	0s
lint-clippy	0s
lint-readme	0s
lint-rustfmt	0s
linting-done	2s
calculate-test-jobs	8s
trial-olddeps	7m 39s
portdb (3.8, 11)	2m 52s
complement (monolith, SQLite)	12m 1s
portdb (3.11, 15)	3m 6s
complement (monolith, Postgres)	13m 52s
cargo-test	0s
complement (workers, Postgres)	20m 3s
trial-pypy	0s
cargo-bench	0s
sytest (focal)	8m 39s
sytest (focal, postgres)	10m 1s
sytest (focal, multi-postgres, workers)	13m 3s
trial (3.8, sqlite, all)	4m 59s
sytest (focal, multi-postgres, workers, asyncio)	19m 9s
trial (3.8, postgres, 11, all)	11m 50s
trial (3.8, sqlite)	4m 33s
export-data	2m 10s
tests-done	4s
	2h 19m 32s

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