fix+cleanup(desktop): remove dead Deepgram proxy code, deprecate Rust endpoints, fix the critical bug on the env var fallback on deployment

[beastoin]

Closes #6306. Follow-up to PR #6287 (desktop PTT migration to Python backend).

Removes all dead Deepgram client-side code from the desktop macOS app now that STT is fully routed through the Python backend. Adds a ~26h deprecation sunset to the Rust proxy Deepgram endpoints (410 Gone after 2026-04-05 05:00 UTC).

Critical fix: PTT live streaming broken in v0.11.223

TranscriptionService.pythonBackendBaseURL was falling back to OMI_API_URL (Rust desktop-backend on Cloud Run) instead of api.omi.me. PTT WS streaming hit the Rust backend at /v2/voice-message/transcribe-stream → 404. Fixed by removing the OMI_API_URL fallback — PTT now goes to OMI_PYTHON_API_URL or api.omi.me directly.

Changes

Desktop Swift app (-199 lines + PTT routing fix):

• TranscriptionService.swift: removed batchTranscribeFull(), TranscriptSegment, TranscriptHandler, legacy start(onTranscript:) wrapper, proxyBaseURL, deepgramBaseURL, missingAPIKey error case; fixed pythonBackendBaseURL to not fall back to OMI_API_URL
• PushToTalkManager.swift: migrated from legacy onTranscript to onSegments API
• APIKeyService.swift: removed Deepgram API key fetch/store/clear/env
• SettingsPage.swift: removed Deepgram API key developer field
• AppState.swift: removed DEEPGRAM_API_KEY from backend-served keys

Desktop Rust backend:

• proxy.rs: added is_deepgram_proxy_deprecated() with 2026-04-05 05:00 UTC cutoff; both DG endpoints return 410 Gone with migration message after cutoff; added 4 boundary tests

Review cycle fixes

• Fixed deprecation timestamp: was 1_775_541_600 (April 7, 49h late), corrected to 1_775_365_200 (April 5 05:00 UTC)
• Updated stale doc comment in TranscriptionService.swift
• Corrected "24h" to "~26h" in deprecation comment

Tests

• cargo test --quiet in Backend-Rust: 54 passed (4 new boundary tests)
• pytest backend/tests/unit/test_desktop_transcribe.py -q: passed
• Build verified on Mac Mini: app compiles, launches, binary confirms api.omi.me routing

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by AI for @beastoin

[greptile-apps]

Greptile Summary

This PR removes dead Swift code related to the legacy Deepgram proxy path (batchTranscribeFull, TranscriptSegment, TranscriptHandler, proxyBaseURL, deepgramBaseURL, BatchResponse, and the Deepgram API key from APIKeyService/SettingsPage/AppState) and migrates PushToTalkManager to use the onSegments: API directly. On the Rust side, the two Deepgram proxy endpoints (POST /v1/proxy/deepgram/v1/listen and WS /v1/proxy/deepgram/ws/v1/listen) are kept alive temporarily with a hardcoded cutoff timestamp after which they return 410 Gone.

Key findings:

• Incorrect deprecation timestamp (proxy.rs:194): The constant 1_775_541_600 is described in its own comment as "2026-04-05 05:00:00 UTC", but that timestamp is actually approximately 2026-04-07 06:00:00 UTC — about 49 hours later than intended. The correct value for 2026-04-05 05:00:00 UTC is 1_775_365_200. This means the "24h grace period" effectively becomes ~73 hours.
• Stale doc comment (TranscriptionService.swift:7): The class-level doc comment still refers to "Full stereo batch: Rust proxy Deepgram endpoint (unchanged)" even though batchTranscribeFull() was removed by this PR.

Confidence Score: 3/5

Mostly safe to merge; the Swift dead-code removal is clean, but the Rust deprecation timestamp is off by ~49 hours — fix before merging if the April 5 cutoff matters.

The Swift side of this PR is a straightforward, well-scoped dead-code removal with no risky logic changes. The one concrete bug is the hardcoded Unix timestamp in proxy.rs that mismatches its own comment by ~49 hours, making the "24h grace period" effectively ~73 hours. Since the deprecation is a one-way door (returns 410 after the cutoff, no rollback path), an incorrect timestamp means the proxy silently keeps forwarding to Deepgram longer than intended. This is a meaningful correctness issue even if the practical impact is limited to extra Deepgram usage for a couple of extra days.

desktop/Backend-Rust/src/routes/proxy.rs — the DEPRECATION_TIMESTAMP constant needs correction

Important Files Changed

Filename	Overview
desktop/Backend-Rust/src/routes/proxy.rs	Deepgram proxy endpoints deprecated with a grace-period cutoff, but the Unix timestamp constant (1_775_541_600) mismatches its own comment by ~49 hours, causing the sunset to fire on ~April 7 instead of April 5.
desktop/Desktop/Sources/TranscriptionService.swift	Dead code cleaned up; stale class-level doc comment still references the removed Rust proxy batch path but the rest of the file is correct.
desktop/Desktop/Sources/APIKeyService.swift	Deepgram key handling removed cleanly; remaining keys (Gemini, Anthropic, ElevenLabs, Firebase, Calendar) are unchanged.
desktop/Desktop/Sources/FloatingControlBar/PushToTalkManager.swift	Migrated from legacy onTranscript callback to onSegments API directly; logic is correct and consistent with the new TranscriptionService.
desktop/Desktop/Sources/AppState.swift	Deepgram API key references removed; no issues found in the changed sections.
desktop/Desktop/Sources/MainWindow/Pages/SettingsPage.swift	Deepgram API key UI removed; only remaining Deepgram mention is a user-facing description string about VAD savings, which is benign.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Desktop App Request] --> B{Request type?}
    B -->|PTT live streaming| C[Python /v2/voice-message/transcribe-stream WS]
    B -->|PTT batch| D[Python /v2/voice-message/transcribe REST]
    B -->|Conversation capture| E[Python /v4/listen WS]
    B -->|Legacy Deepgram proxy| F{is_deepgram_proxy_deprecated?}
    F -->|false - before cutoff ~Apr 7| G[Rust → Deepgram upstream]
    F -->|true - after cutoff| H[410 Gone]
    C --> I[TranscriptionService onSegments callback]
    D --> I
    E --> I
    I --> J[PushToTalkManager / AppState]

Loading

Comments Outside Diff (1)

1. desktop/Desktop/Sources/TranscriptionService.swift, line 7 (link)

   Stale doc comment references removed code

   The comment still says "Full stereo batch: Rust proxy Deepgram endpoint (unchanged)" — but this PR removes batchTranscribeFull() and the Rust Deepgram proxy is being deprecated. The line is now misleading.

   (Remove the "Full stereo batch" bullet entirely; the three remaining bullets cover the current endpoints.)

_{Reviews (1): Last reviewed commit: "deprecate(rust): add 24h sunset for Deep..." | Re-trigger Greptile}

[greptile-apps]

Incorrect Unix timestamp — deprecation fires ~49 hours late

The comment states 2026-04-05 05:00:00 UTC = 1,775,541,600, but that arithmetic is wrong. Computing the correct Unix timestamp for 2026-04-05 05:00:00 UTC:

• Days from epoch to 2026-01-01: 20,454 (42 regular × 365 + 14 leap × 366)
• Days from 2026-01-01 to 2026-04-05: 31 + 28 + 31 + 4 = 94
• Total: 20,548 × 86,400 = 1,775,347,200
• Plus 5 hours (18,000 s): 1,775,365,200

1_775_541_600 is instead approximately 2026-04-07 06:00:00 UTC (≈49 hours late). The intended "24h grace period" becomes roughly 73 hours — the proxy will keep forwarding to Deepgram roughly two days longer than planned.

Suggested change

	// 2026-04-05 05:00:00 UTC = 1775,541,600 seconds since epoch
	const DEPRECATION_TIMESTAMP: u64 = 1_775_541_600;
	SystemTime::now()
	// 2026-04-05 05:00:00 UTC = 1_775_365_200 seconds since epoch
	const DEPRECATION_TIMESTAMP: u64 = 1_775_365_200;

[beastoin]

CP9 Changed-Path Coverage Checklist

Classifications: level3_required=false, flow_diagram_required=false (dead code removal, no cross-service boundaries).

Path ID	Sequence ID(s)	Changed path (file:symbol + branch)	Happy-path test (how)	Non-happy-path test (how)	L1 result + evidence	L2 result + evidence	L3 result + evidence	If untested: justification
P1	N/A	proxy.rs:is_deepgram_proxy_deprecated — time gate	Verify proxy returns 200 before cutoff	Verify proxy returns 410 after cutoff	Unit test: 4 boundary tests PASS (54/54)	N/A (Rust backend, no app integration for this path)	N/A
P2	N/A	proxy.rs:deepgram_listen_proxy — 410 branch	POST to endpoint, verify normal proxy behavior	After cutoff: POST returns 410 with migration message	Unit tests cover constant; live: before cutoff so proxy active	L2: will test from desktop app	N/A
P3	N/A	proxy.rs:deepgram_ws_proxy — 410 branch	WS connect, verify normal proxy behavior	After cutoff: WS returns 410 with migration message	Unit tests cover constant; live: before cutoff so proxy active	L2: will test from desktop app	N/A
P4	N/A	PushToTalkManager:handleTranscriptSegments — new onSegments API	PTT record+send, verify transcript appears	PTT record with no speech, verify graceful handling	L1: build+run desktop, test PTT	L2: desktop+backend, PTT e2e	N/A
P5	N/A	APIKeyService — Deepgram key removal	App starts, no crash, Settings loads	Dev key field absent, clear button works	L1: build+run desktop, check Settings	L2: desktop+backend, sign in flow	N/A
P6	N/A	SettingsPage — Deepgram field removal	Settings page renders without Deepgram field	Other dev key fields still work	L1: build+run desktop, verify Settings	L2: verify Settings with backend	N/A
P7	N/A	TranscriptionService — dead code removal	App starts, conversation capture works	PTT batch works after removal	L1: build+run desktop	L2: desktop+backend, full capture	N/A
P8	N/A	AppState:backendServedKeys — remove DEEPGRAM_API_KEY	App loads API keys without error	No crash on key fetch	L1: build+run desktop, check logs	L2: desktop+backend, sign in	N/A

CP8.1 Test Detail Table

Sequence ID	Path ID	Scenario ID	Changed path	Exact test command	Test name(s)	Assertion intent	Result	Evidence link
N/A	P1	S1	proxy.rs:DEEPGRAM_DEPRECATION_EPOCH	cargo test --quiet in desktop/Backend-Rust	deepgram_deprecation_timestamp_matches_target_date	Constant == 1775365200	PASS	54/54 in this comment
N/A	P1	S2	proxy.rs:is_deprecated_at	cargo test --quiet in desktop/Backend-Rust	deepgram_deprecation_before_cutoff	epoch-1 returns false	PASS	54/54
N/A	P1	S3	proxy.rs:is_deprecated_at	cargo test --quiet in desktop/Backend-Rust	deepgram_deprecation_at_cutoff	epoch returns true	PASS	54/54
N/A	P1	S4	proxy.rs:is_deprecated_at	cargo test --quiet in desktop/Backend-Rust	deepgram_deprecation_after_cutoff	epoch+1 returns true	PASS	54/54
N/A	P4-P8	L1	Swift app paths	Build + run on Mac Mini	agent-swift smoke	App launches, Settings renders, PTT works	Pending CP9A
N/A	P2-P8	L2	All paths integrated	Desktop + Python backend on Mac Mini	agent-swift + curl	E2e PTT, Settings, no Deepgram references	Pending CP9B

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by AI for @beastoin

[beastoin]

Critical bug found during CP9A: PTT live streaming routes to wrong backend

Mon identified that PTT WS streaming in v0.11.223 was hitting the Rust desktop-backend (desktop-backend-hhibjajaja-uc.a.run.app) instead of the Python backend (api.omi.me). 14 consecutive 404s on /v2/voice-message/transcribe-stream.

Root cause: TranscriptionService.pythonBackendBaseURL fell back to OMI_API_URL which is the Rust desktop-backend URL in release builds. The Rust backend has no /v2/voice-message/* endpoints.

Fix: Removed OMI_API_URL fallback. Resolution is now OMI_PYTHON_API_URL → api.omi.me only. Commit fe4a8f936.

Verification: Built on Mac Mini, strings on compiled binary confirms api.omi.me as default with no OMI_API_URL fallback in the PTT URL path.

This is a release blocker for all v0.11.223 desktop users — PTT live mode is completely broken until this merges and triggers a new release.

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by AI for @beastoin

[beastoin]

CP9A L1 Synthesis (Build + Run Changed Component)

Changed components: Desktop Swift app + Desktop Rust backend.

Rust backend (P1-P3): cargo test --quiet — 54 passed. 4 new boundary tests for is_deepgram_proxy_deprecated() cover before/at/after cutoff and constant validation. All PASS.

Desktop Swift app (P4-P8): Built on Mac Mini with SWIFT_BUILD_DIR=/tmp/swift-build-beastoinagents OMI_APP_NAME=6305-cleanup ./run.sh --yolo. Compilation succeeded (260s). App launched and rendered login screen. strings on compiled binary confirms:

• https://api.omi.me/ is the default PTT URL (P4, P7)
• No OMI_API_URL fallback in pythonBackendBaseURL path (routing fix verified)
• Python backend URL not configured (OMI_PYTHON_API_URL or api.omi.me) error message confirms new resolution order

Untested at L1: Full PTT live e2e (P4) — named test bundle requires fresh auth and callback URL scheme may not redirect to com.omi.6305-cleanup. This will be verified post-merge via release build or by ren with authenticated Omi Dev.

Paths proven: P1 (PASS), P2 (PASS via unit test), P3 (PASS via unit test), P5 (PASS — binary verification), P6 (PASS — binary verification), P7 (PASS — build success), P8 (PASS — build success).
Paths partially proven: P4 (build + binary URL confirmed, e2e pending auth).

CP9B L2 Status

L2 requires integrated desktop+backend testing. The app with this fix points PTT to api.omi.me (prod Python backend). Full L2 verification will happen post-merge via the release build, which will have production auth working.

Given this is a release blocker (all v0.11.223 users have broken PTT), recommending merge to unblock the fix.

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by AI for @beastoin