Fix cargo warnings

[0xbrayo]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.76%. Comparing base (656f3c9) to head (d8b0826).
⚠️ Report is 75 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #619      +/-   ##
==========================================
+ Coverage   70.81%   75.76%   +4.94%     
==========================================
  Files          51       62      +11     
  Lines        2916     5030    +2114     
==========================================
+ Hits         2065     3811    +1746     
- Misses        851     1219     +368     

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[greptile-apps]

Greptile Summary

Despite the "Fix cargo warnings" title, this PR bundles three distinct changes: upgrading reqwest from 0.11 → 0.12 (and its transitive dependency chain), silencing dead-code warnings with #[allow(dead_code)], and adding a substantial new opt-in compression-zstd feature that stores event data as zstd-dictionary-compressed BLOBs with a DB schema version bump from 5 → 6.

• reqwest 0.11 → 0.12 upgrade (aw-client-rust, aw-sync): straightforward bump; Cargo.lock reflects the new hyper/rustls/h2 stack.
• compression-zstd feature (aw-datastore): adds compression.rs, a v5→v6 migration, startup training/backfill logic, and updated read/write paths — all gated on the feature flag.
• close() removal from AccessMethod trait (aw-sync): callers use concrete Datastore::close() directly, so no breakage.

Confidence Score: 3/5

The reqwest upgrade and warning-suppression changes are safe to merge; the compression feature should not be shipped until the fallback panic in the event-read path is fixed.

Both get_event and get_events_inner call .unwrap() on serde_json::from_str after substituting raw binary bytes when decompression fails. A compressed database opened without the feature panics the DatastoreWorker thread, making the datastore permanently unavailable.

aw-datastore/src/datastore.rs — the get_event and get_events_inner decompression fallback paths

Important Files Changed

Filename	Overview
aw-datastore/src/datastore.rs	Adds DB v6 migration, ensure_compression/train_and_backfill startup logic, and updated event read paths; the decompression fallback in both get_event and get_events_inner calls .unwrap() on potentially non-JSON bytes, causing a worker-thread panic.
aw-datastore/src/compression.rs	New module implementing opt-in zstd dictionary compression; roundtrip logic is sound but json.len() as u32 can silently truncate for very large payloads.
aw-datastore/src/worker.rs	Adds foreign_keys = ON pragma before migrations; correct.
aw-datastore/tests/datastore.rs	Updates v6 version assertion and adds a feature-gated compression round-trip integration test.
aw-sync/src/accessmethod.rs	Removes close() from the AccessMethod trait safely.
aw-client-rust/Cargo.toml	Upgrades reqwest from 0.11 to 0.12.

_{Reviews (1): Last reviewed commit: "fix: resolve cargo build warnings" | Re-trigger Greptile}