Memory leak: 2GB RAM after ~2.5 days of running

[punkhop]

Environment

• RepoBar version: 0.1.1 (2)
• macOS: 26.2 (25C56)
• Architecture: ARM64
• Repos monitored: 12

Issue

After running for approximately 2.5 days, RepoBar accumulated ~2GB of memory (physical footprint). After a restart, memory usage dropped to ~77MB.

Diagnostics

Memory snapshot before restart:

TOTAL                                 5.0G     1.1G   139.2M     1.8G       0K    2384K    5504K    27748
                                    VIRTUAL   RESIDENT  DIRTY   SWAPPED

MALLOC zones showed fragmentation:

DefaultMallocZone: 307.1M virtual, 93MB resident, 56% fragmented
AttributeGraph: 16MB (SwiftUI state graph)

Process sample showed the app was idle (waiting in mach_msg2_trap), not actively leaking during sampling - suggests gradual accumulation over time.

Disk caches were fine:

• Cache.db: ~1.1MB
• RepoDetailCache: 408KB
• Total cache folder: 66MB

Likely cause

SwiftUI view state accumulation over time. Each GitHub API poll may be retaining response data or view state without proper release.

Workaround

Periodic restart of the app.

Steps to reproduce

1. Configure RepoBar with ~12 repositories
2. Let it run for 2-3 days
3. Observe memory growth via Activity Monitor or top

[ggfevans]

Ran this through a codebase analysis for potential memory leaks, using Claude Code.

Identified Memory Leaks:

1. ETagCache (Most likely culprit)

File: Sources/RepoBarCore/Support/ETagCache.swift:5
private var store: [String: (etag: String, data: Data)] = [:]

• Stores full API response Data for every URL ever fetched
• Never evicted - only manually cleared via Debug Settings
• With 12 repos polling multiple endpoints every few minutes for 2.5 days, this accumulates significant data

2. RecentListCache (9 unbounded caches)

File: Sources/RepoBar/StatusBar/RecentMenuService.swift:322-359
private var entries: [String: Entry] = [:] // Never pruned

• 9 separate caches (issues, PRs, releases, commits, discussions, tags, branches, contributors, workflow runs)
• Each stores data per repository key
• Old repository entries never removed

3. recentCommitCounts dictionary

File: Sources/RepoBar/StatusBar/RecentMenuService.swift:21
private var recentCommitCounts: [String: Int] = [:]

• Grows with each repo but never cleared

Why it happens

The clearCaches() method exists but is only called:

1. Manually from Debug Settings
2. On logout

There's no automatic eviction - caches just grow forever during normal operation.

I will put together a PR for this.