* refactor: fixes transcript duration type, NaN in waveform, and prepare for postgres migration
* fix: ensure we don't have NaN in waveform
* fix: missing assertionerror
Co-authored-by: pr-agent-monadical[bot] <198624643+pr-agent-monadical[bot]@users.noreply.github.com>
* fix: potential empty array
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Co-authored-by: pr-agent-monadical[bot] <198624643+pr-agent-monadical[bot]@users.noreply.github.com>