TTS layer landed as schema-only — synthesis pipeline ships in v0.2.
Putting the tables in v0.1 means imports already carry the right
shape; we won't need a 'migrate every existing story' pass later.
Decisions locked 2026-05-13:
- Engine: F5-TTS (best 8GB FOSS option, mid-2026 SOTA)
- Default voice source: LJ Speech (Linda Johnson, PD released
specifically for TTS training — airtight for sharing/uploading
generated audio. The 'AI-consent-released' license posture is
the difference between 'should be fine' and 'definitely fine.')
- Variety voices: Hi-Fi TTS speaker IDs (Apache 2.0, same consent
shape). LibriVox is optional but never default.
- Pronunciation overrides DB layer (story-scoped + global) to fix
proper-noun mispronunciation — the actual TTS-quality gap on
Cobb's bar of 'must not wake me up.' Pre-pass with Opus extracts
proper nouns + IPA, operator verifies, table caches forever.
Tables:
- voices — name, license, reference_path/text, sample_rate, default flag
- pronunciation_overrides — story-scoped or global, IPA/arpabet
- narration_runs — TTS audit trail mirroring generation_runs
- stories.preferred_voice_id FK
Unique constraints:
- one default voice (partial index)
- one row per (story, word) override
- one global row per word
Kayos
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