fix(db): disable SQLite mmap to prevent DB size inflating RSS

[zhumengzhu]

Issue for this PR

Ref #22428 (same fix, that PR is still open — this supersedes it).

Type of change

• Bug fix

What does this PR do?

Bun enables SQLite memory-mapped I/O by default, mapping the entire DB file
into the process address space. A 1.1 GB database adds ~1.8 GB to RSS
regardless of how much data is actually accessed. One line added to the
existing PRAGMA initialization block in src/storage/db.ts:

db.run("PRAGMA mmap_size = 0")

Same fix as proposed by @jiangliang79 in #22428.

How did you verify your code works?

• Full test suite passes (1890 pass, pre-existing 1 fail unrelated to this change)
• Confirmed mmap_size PRAGMA was not previously set in the codebase

Screenshots / recordings

N/A

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Related PR Found:

• PR fix: disable SQLite mmap to prevent memory growing with DB size #22428: "fix: disable SQLite mmap to prevent memory growing with DB size"
  • fix: disable SQLite mmap to prevent memory growing with DB size #22428

Why it's related: This is the exact PR mentioned in the current PR's description. PR #22553 is explicitly stated to supersede #22428 as it implements the same fix (adding PRAGMA mmap_size = 0 to prevent SQLite memory-mapped I/O from inflating RSS). The current PR is the updated version that should be merged instead of #22428.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[zhumengzhu]

Closing in favor of #22428 which proposes the identical fix with more detailed analysis (macOS ARM64 footprint measurements). Please consider merging that one.