# models
## AlignmentStepState
TypedDict for Phase 2 right column (VAD alignment) state.
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### AlignmentStepState
``` python
def AlignmentStepState(
args:VAR_POSITIONAL, kwargs:VAR_KEYWORD
):
```
*State for Phase 2 (right column): Temporal Alignment.*
## VADChunk
Represents a voice activity detection time range from the VAD plugin.
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### VADChunk
``` python
def VADChunk(
index:int, start_time:float, end_time:float, audio_file_index:int=0
)->None:
```
*A voice activity detection time range.*
## AlignmentUrls
URL bundle for Phase 2 alignment route handlers and renderers.
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source
### AlignmentUrls
``` python
def AlignmentUrls(
card_stack:CardStackUrls=, init:str='', audio_src:str='', toggle_auto_nav:str=''
)->None:
```
*URL bundle for Phase 2 alignment route handlers and renderers.*
## Tests
``` python
# VADChunk with audio_file_index
chunk = VADChunk(index=0, start_time=1.0, end_time=3.5, audio_file_index=2)
assert chunk.audio_file_index == 2
assert chunk.duration == 2.5
d = chunk.to_dict()
assert d["audio_file_index"] == 2
assert VADChunk.from_dict(d).audio_file_index == 2
# Backward compat: missing audio_file_index defaults to 0
legacy = {"index": 5, "start_time": 0.0, "end_time": 1.0}
assert VADChunk.from_dict(legacy).audio_file_index == 0
# Legacy field removal still works
legacy_with_assigned = {"index": 0, "start_time": 0.0, "end_time": 1.0, "assigned_segment": None}
assert VADChunk.from_dict(legacy_with_assigned).audio_file_index == 0
print("VADChunk model tests passed")
```