Native WT-checkpoint backups, admin UI /oplog page, and change-stream fidelity wins
Summary: Native WT-checkpoint backups, admin UI /oplog page, and change-stream fidelity wins (v0.5.1b18).
The natural follow-on to v0.5.1b17's local.oplog.rs synthetic
collection lands as the admin UI /oplog page: a paged entry
browser with a window selector (last 50 / 500 / 5000), op-checkbox
filter (i / u / d / c / n), ns substring filter, and a
per-row expandable JSON body. Auto-refreshes every 5 s. The data
source is just client.local.oplog_rs.find() — no new server-side
surface needed, only the page chrome and an _rows partial that
follows the same pattern as /connections + /cursors.
showExpandedEvents on change streams now matches mongod: the flag
defaults to false, and DDL "expanded" events (createIndexes,
dropIndexes) are suppressed unless the user opts in via
coll.watch(show_expanded_events=True). Previously these surfaced
unconditionally — more permissive than mongod, and broke the
conformance contract for tests that assume the stable v1 event set.
killOp lands as a real wire command that closes the target
connection's socket via shutdown(SHUT_RDWR). Any in-flight command
finishes, the per-connection thread's next recv returns 0, the
loop exits, and the connection unregisters cleanly. Real mongod uses
a per-op interrupt flag, which would need cancellation infrastructure
SecantusDB doesn't carry — but "close the socket" is the visible
end-state users care about, and the kill-and-reap admin button on
/connections is now functional.
$sample becomes deterministic when SECANTUS_SAMPLE_SEED=<n> is
set in the environment. Builds a dedicated random.Random(seed)
instance at module load instead of mutating the global random
state, so other code sharing the process keeps its own entropy.
Closes the long-standing test-flake source where $sample results
varied run-to-run.