Five stores set private page caches of 16 to 64 MB per connection.
The modernc driver allocates that cache with anonymous mmap outside
the Go heap, so GC and GOMEMLIMIT never see it, and each page costs
about twice its size. Measured: reading a 107 MB database through a
64 MB cache_size added 117 MB of resident memory, against 6 MB at
SQLite's 2 MB default. On a long-running dogfood install about 165 MB
of 360 MB resident sat outside the Go heap, with a 126 MB audit
database behind a 64 MB cache (#1803).
Audit, RBAC, notification queue, unified resources and the alert
event log (writer and both readers) now take pdb.PageCachePragma.
Pages that miss it come from the kernel file cache, which the kernel
can reclaim. The audit suite, including its large legacy migration,
takes the same time as before (309 s on both trees).
pkg/db tests reject any other cache_size in production code and bound
the resident growth of a 30 MB scan. Each store's test pins its
effective value. Negative controls: restoring the audit cache fails
the source scan, and a 64 MB reader cache grows a scan by 55 MB
against a 16 MB budget. modernc sorts _pragma values before applying
them, so a second cache_size in one DSN cannot reliably override.
Related to #1803
Keep canonical disk risk, source freshness and retained history intact when
Assistant and Patrol gather evidence. Proposal acceptance validates an action
contract and must not rewrite uncertain conclusions as established root cause.
Preserve complete subscription tool batches without exposing routing envelopes
as answers. Keep wide answer tables readable and keyboard-scrollable on mobile.
Optimize retained tier reconciliation without discarding gaps or newer samples.
Record failed real-model diagnoses and outstanding autonomous qualification
separately from passing data-path and interface checks.
Three new branch-coverage tests taking eighteen previously unreached functions
from 0.0% to covered.
internal/cloudcp/registry: the workspace limit error message on both the nil
and populated receiver, the active workspace count per account, the tenant
lookup across owning account, foreign account and missing rows, the invitation
listing by email including case and whitespace normalization, and the
invitation delete for both an existing pair and a pair that never existed.
internal/unifiedresources: the Docker container and Kubernetes node typed
views, the presentation listing and the metrics target, each asserted on the
nil receiver, the nil nested payload and the populated case, with returned
slices proven independent of the store.
pkg/db: the tracing wrappers around BeginTx, Query, QueryRow and their context
variants plus the pool setters, with exact histogram deltas proving the
observe wiring rather than that SQLite works.
All three files are new; no source or existing test was touched.
Contract-Neutral: test-only: new Go branch-coverage tests, no source or contract change
rcourtman