[KKould]

What problem does this PR solve?

TPCC could not compare KiteSQL and SQLite under the same durability setting, and primary-key point lookups opened a new LMDB cursor per key.

Issue link:

What is changed and how it works?

• Add DataBaseBuilder::sync (RocksDB sync writes / LMDB NO_SYNC) and a tpcc --sync flag shared by all backends, replacing the SQLite-only --sqlite-profile.
• Remove the tpcc-sqlite-practical/tpcc-sqlite-balanced make targets accordingly.
• Reuse one storage cursor across primary-key point lookups in an index scan (Transaction::point_cursor/get_at).

Code changes

• Has Rust code change
• Has CI related scripts change

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Note for reviewer

• Validation: make test passes (517 tests) and all SLT files pass; the lookup path is covered by existing index-scan tests.
• tpcc --sqlite-profile is removed; use --sync instead (default off).

[codecov]

Codecov Report

❌ Patch coverage is 63.49206% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.64%. Comparing base (c78efe9) to head (49eaa7f).

Files with missing lines	Patch %	Lines
src/db.rs	0.00%	11 Missing ⚠️
src/storage/rocksdb.rs	50.00%	10 Missing ⚠️
src/storage/lmdb.rs	92.30%	1 Missing ⚠️
src/storage/mod.rs	93.75%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (63.49%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
- Coverage   93.68%   93.64%   -0.05%     
==========================================
  Files         260      260              
  Lines       48783    48844      +61     
==========================================
+ Hits        45704    45741      +37     
- Misses       3079     3103      +24     

Flag	Coverage Δ
rust	93.64% <63.49%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/storage/memory.rs	96.44% <100.00%> (+0.04%)	⬆️
src/storage/lmdb.rs	93.83% <92.30%> (-0.08%)	⬇️
src/storage/mod.rs	93.27% <93.75%> (+<0.01%)	⬆️
src/storage/rocksdb.rs	82.52% <50.00%> (-0.84%)	⬇️
src/db.rs	92.72% <0.00%> (-0.70%)	⬇️

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