Use IMMEDIATE transactions with dedicated connections to fix race condition
where multiple processes creating issues concurrently caused "UNIQUE constraint
failed: issues.id" errors.
Key changes:
- Use BEGIN IMMEDIATE to acquire RESERVED lock early
- Use dedicated connection (sql.Conn) for transaction to ensure all operations
happen on same connection
- Increase busy_timeout from 10s to 30s for better parallel write handling
- Use context.Background() for ROLLBACK to ensure cleanup even if ctx cancelled
Added regression test TestParallelIssueCreation that creates 20 issues in
parallel and verifies no ID collisions occur.
Fixes#6🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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