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torin fab2094e34 feat: complete voice session safety and confirmation flow

2026-04-20 16:10:15 +08:00

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实现草案：语音共创 Phase A 数据迁移与 API Schema

Version: 0.1
Date: 2026-04-19
Status: Draft / Ready for implementation handoff

1. 目的

这份文档是语音共创 Phase A 技术方案的下一层实现草案。

它的目标很明确：

把数据库迁移命名、表结构和索引钉住
把后端文件落点钉住
把 Pydantic schema 草图钉住
把 API request / response 和错误语义钉住

这样下一步真正写代码时，可以直接从这份草案拆成：

Alembic migration
SQLAlchemy models
Pydantic schemas
API routes
Service implementation

2. 建议变更清单

2.1 新增 Alembic revision

建议 revision 文件名：

backend/alembic/versions/0013_add_voice_sessions_phase_a.py

建议 revision metadata：

revision = "0013_add_voice_sessions_phase_a"
down_revision = "0012_story_text_status"
branch_labels = None
depends_on = None

2.2 建议新增后端文件

backend/app/api/voice_sessions.py
backend/app/schemas/voice_session_schemas.py
backend/app/services/voice_session_service.py
backend/app/services/voice_session_storage.py
backend/tests/test_voice_sessions.py

2.3 建议改动现有文件

backend/app/db/models.py 增加 VoiceSession / VoiceTurn / VoiceSessionEvent
backend/app/main.py 注册 voice session 路由
docs/README.md 文档索引

3. 数据库迁移草案

3.1 新表：`voice_sessions`

设计目标

承载一个语音共创会话
与正式 stories 解耦
可恢复、可收束、可排障

建议字段

Column	Type	Nullable	Default	Notes
`id`	`String(36)`	No	uuid	主键
`user_id`	`String(255)`	No	-	FK -> `users.id`
`child_profile_id`	`String(36)`	Yes	-	FK -> `child_profiles.id`
`universe_id`	`String(36)`	Yes	-	FK -> `story_universes.id`
`final_story_id`	`Integer`	Yes	-	FK -> `stories.id`
`target_mode`	`String(32)`	No	`"story"`	Phase A 固定 story
`status`	`String(32)`	No	`"draft"`	`draft/active/processing_turn/waiting_user/finalizing_story/completed/abandoned/failed`
`current_turn_index`	`Integer`	No	`0`	当前轮次
`working_title`	`String(255)`	Yes	-	会话中临时标题
`story_state`	`JSON`	No	`"{}"`	中间故事状态
`latest_user_transcript`	`Text`	Yes	-	最近一轮用户转写
`latest_assistant_text`	`Text`	Yes	-	最近一轮系统文本
`last_error`	`Text`	Yes	-	最近错误
`created_at`	`DateTime(timezone=True)`	No	`now()`	创建时间
`updated_at`	`DateTime(timezone=True)`	No	`now()`	更新时间

建议索引

ix_voice_sessions_user_id
ix_voice_sessions_child_profile_id
ix_voice_sessions_universe_id
ix_voice_sessions_final_story_id
ix_voice_sessions_status
ix_voice_sessions_created_at

3.2 新表：`voice_turns`

设计目标

记录每一轮语音输入与系统响应
既能支持恢复，也能支持调试

建议字段

Column	Type	Nullable	Default	Notes
`id`	`String(36)`	No	uuid	主键
`session_id`	`String(36)`	No	-	FK -> `voice_sessions.id`
`turn_index`	`Integer`	No	-	从 1 开始
`status`	`String(32)`	No	`"received"`	`received/transcribing/intent_resolved/narrative_ready/audio_ready/failed`
`user_audio_path`	`String(500)`	Yes	-	原始录音路径
`user_audio_mime_type`	`String(100)`	Yes	-	例如 `audio/webm`
`user_audio_duration_ms`	`Integer`	Yes	-	客户端上报或服务端探测
`user_transcript`	`Text`	Yes	-	转写文本
`transcript_confidence`	`Float`	Yes	-	ASR 置信度
`detected_intent`	`String(32)`	No	`"unknown"`	`start_story/continue_story/correct_story/end_story/save_story/unknown`
`intent_confidence`	`Float`	Yes	-	意图识别置信度
`story_patch`	`JSON`	No	`"{}"`	本轮对故事状态的 patch
`assistant_text`	`Text`	Yes	-	系统文本回应
`assistant_audio_path`	`String(500)`	Yes	-	系统音频路径
`assistant_audio_duration_ms`	`Integer`	Yes	-	系统音频长度
`error_message`	`Text`	Yes	-	本轮错误
`created_at`	`DateTime(timezone=True)`	No	`now()`	创建时间
`updated_at`	`DateTime(timezone=True)`	No	`now()`	更新时间

约束与索引建议

Unique constraint:
- uq_voice_turn_session_turn_index on ("session_id", "turn_index")
Indexes:
- ix_voice_turns_session_id
- ix_voice_turns_status
- ix_voice_turns_created_at

3.3 新表：`voice_session_events`

设计目标

追加式记录会话层事件
不和 generation_job_events 混表

建议字段

Column	Type	Nullable	Default	Notes
`id`	`Integer`	No	autoincrement	主键
`session_id`	`String(36)`	No	-	FK -> `voice_sessions.id`
`turn_id`	`String(36)`	Yes	-	FK -> `voice_turns.id`
`event_type`	`String(64)`	No	-	见后文事件建议
`status`	`String(32)`	No	-	`received/succeeded/failed/info` 等
`message`	`Text`	Yes	-	用户可读或日志信息
`event_metadata`	`JSON`	No	`"{}"`	附加信息
`created_at`	`DateTime(timezone=True)`	No	`now()`	创建时间

建议索引

ix_voice_session_events_session_id
ix_voice_session_events_turn_id
ix_voice_session_events_created_at

4. Alembic 迁移草案

下面这段不是最终可直接执行的生产代码，但已经足够接近真实 migration：

"""add voice co-creation phase a tables

Revision ID: 0013_add_voice_sessions_phase_a
Revises: 0012_story_text_status
Create Date: 2026-04-19

"""

import sqlalchemy as sa
from alembic import op

revision = "0013_add_voice_sessions_phase_a"
down_revision = "0012_story_text_status"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "voice_sessions",
        sa.Column("id", sa.String(length=36), nullable=False),
        sa.Column("user_id", sa.String(length=255), nullable=False),
        sa.Column("child_profile_id", sa.String(length=36), nullable=True),
        sa.Column("universe_id", sa.String(length=36), nullable=True),
        sa.Column("final_story_id", sa.Integer(), nullable=True),
        sa.Column("target_mode", sa.String(length=32), nullable=False, server_default="story"),
        sa.Column("status", sa.String(length=32), nullable=False, server_default="draft"),
        sa.Column("current_turn_index", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("working_title", sa.String(length=255), nullable=True),
        sa.Column("story_state", sa.JSON(), nullable=False, server_default="{}"),
        sa.Column("latest_user_transcript", sa.Text(), nullable=True),
        sa.Column("latest_assistant_text", sa.Text(), nullable=True),
        sa.Column("last_error", sa.Text(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["child_profile_id"], ["child_profiles.id"], ondelete="SET NULL"),
        sa.ForeignKeyConstraint(["universe_id"], ["story_universes.id"], ondelete="SET NULL"),
        sa.ForeignKeyConstraint(["final_story_id"], ["stories.id"], ondelete="SET NULL"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_voice_sessions_user_id", "voice_sessions", ["user_id"])
    op.create_index("ix_voice_sessions_child_profile_id", "voice_sessions", ["child_profile_id"])
    op.create_index("ix_voice_sessions_universe_id", "voice_sessions", ["universe_id"])
    op.create_index("ix_voice_sessions_final_story_id", "voice_sessions", ["final_story_id"])
    op.create_index("ix_voice_sessions_status", "voice_sessions", ["status"])
    op.create_index("ix_voice_sessions_created_at", "voice_sessions", ["created_at"])

    op.create_table(
        "voice_turns",
        sa.Column("id", sa.String(length=36), nullable=False),
        sa.Column("session_id", sa.String(length=36), nullable=False),
        sa.Column("turn_index", sa.Integer(), nullable=False),
        sa.Column("status", sa.String(length=32), nullable=False, server_default="received"),
        sa.Column("user_audio_path", sa.String(length=500), nullable=True),
        sa.Column("user_audio_mime_type", sa.String(length=100), nullable=True),
        sa.Column("user_audio_duration_ms", sa.Integer(), nullable=True),
        sa.Column("user_transcript", sa.Text(), nullable=True),
        sa.Column("transcript_confidence", sa.Float(), nullable=True),
        sa.Column("detected_intent", sa.String(length=32), nullable=False, server_default="unknown"),
        sa.Column("intent_confidence", sa.Float(), nullable=True),
        sa.Column("story_patch", sa.JSON(), nullable=False, server_default="{}"),
        sa.Column("assistant_text", sa.Text(), nullable=True),
        sa.Column("assistant_audio_path", sa.String(length=500), nullable=True),
        sa.Column("assistant_audio_duration_ms", sa.Integer(), nullable=True),
        sa.Column("error_message", sa.Text(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.ForeignKeyConstraint(["session_id"], ["voice_sessions.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("session_id", "turn_index", name="uq_voice_turn_session_turn_index"),
    )
    op.create_index("ix_voice_turns_session_id", "voice_turns", ["session_id"])
    op.create_index("ix_voice_turns_status", "voice_turns", ["status"])
    op.create_index("ix_voice_turns_created_at", "voice_turns", ["created_at"])

    op.create_table(
        "voice_session_events",
        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
        sa.Column("session_id", sa.String(length=36), nullable=False),
        sa.Column("turn_id", sa.String(length=36), nullable=True),
        sa.Column("event_type", sa.String(length=64), nullable=False),
        sa.Column("status", sa.String(length=32), nullable=False),
        sa.Column("message", sa.Text(), nullable=True),
        sa.Column("event_metadata", sa.JSON(), nullable=False, server_default="{}"),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
        sa.ForeignKeyConstraint(["session_id"], ["voice_sessions.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["turn_id"], ["voice_turns.id"], ondelete="SET NULL"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index(
        "ix_voice_session_events_session_id",
        "voice_session_events",
        ["session_id"],
    )
    op.create_index(
        "ix_voice_session_events_turn_id",
        "voice_session_events",
        ["turn_id"],
    )
    op.create_index(
        "ix_voice_session_events_created_at",
        "voice_session_events",
        ["created_at"],
    )


def downgrade() -> None:
    op.drop_index("ix_voice_session_events_created_at", table_name="voice_session_events")
    op.drop_index("ix_voice_session_events_turn_id", table_name="voice_session_events")
    op.drop_index("ix_voice_session_events_session_id", table_name="voice_session_events")
    op.drop_table("voice_session_events")

    op.drop_index("ix_voice_turns_created_at", table_name="voice_turns")
    op.drop_index("ix_voice_turns_status", table_name="voice_turns")
    op.drop_index("ix_voice_turns_session_id", table_name="voice_turns")
    op.drop_table("voice_turns")

    op.drop_index("ix_voice_sessions_created_at", table_name="voice_sessions")
    op.drop_index("ix_voice_sessions_status", table_name="voice_sessions")
    op.drop_index("ix_voice_sessions_final_story_id", table_name="voice_sessions")
    op.drop_index("ix_voice_sessions_universe_id", table_name="voice_sessions")
    op.drop_index("ix_voice_sessions_child_profile_id", table_name="voice_sessions")
    op.drop_index("ix_voice_sessions_user_id", table_name="voice_sessions")
    op.drop_table("voice_sessions")

5. SQLAlchemy Model 草图

建议落在 backend/app/db/models.py，风格对齐现有 GenerationJob：

class VoiceSession(Base):
    __tablename__ = "voice_sessions"

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=_uuid)
    user_id: Mapped[str] = mapped_column(
        String(255), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    child_profile_id: Mapped[str | None] = mapped_column(
        String(36), ForeignKey("child_profiles.id", ondelete="SET NULL"), nullable=True, index=True
    )
    universe_id: Mapped[str | None] = mapped_column(
        String(36), ForeignKey("story_universes.id", ondelete="SET NULL"), nullable=True, index=True
    )
    final_story_id: Mapped[int | None] = mapped_column(
        Integer, ForeignKey("stories.id", ondelete="SET NULL"), nullable=True, index=True
    )
    target_mode: Mapped[str] = mapped_column(String(32), nullable=False, default="story")
    status: Mapped[str] = mapped_column(String(32), nullable=False, default="draft", index=True)
    current_turn_index: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    working_title: Mapped[str | None] = mapped_column(String(255), nullable=True)
    story_state: Mapped[dict] = mapped_column(JSON, default=dict)
    latest_user_transcript: Mapped[str | None] = mapped_column(Text, nullable=True)
    latest_assistant_text: Mapped[str | None] = mapped_column(Text, nullable=True)
    last_error: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), index=True
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )


class VoiceTurn(Base):
    __tablename__ = "voice_turns"
    __table_args__ = (
        UniqueConstraint("session_id", "turn_index", name="uq_voice_turn_session_turn_index"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=_uuid)
    session_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("voice_sessions.id", ondelete="CASCADE"), nullable=False, index=True
    )
    turn_index: Mapped[int] = mapped_column(Integer, nullable=False)
    status: Mapped[str] = mapped_column(String(32), nullable=False, default="received", index=True)
    user_audio_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
    user_audio_mime_type: Mapped[str | None] = mapped_column(String(100), nullable=True)
    user_audio_duration_ms: Mapped[int | None] = mapped_column(Integer, nullable=True)
    user_transcript: Mapped[str | None] = mapped_column(Text, nullable=True)
    transcript_confidence: Mapped[float | None] = mapped_column(Float, nullable=True)
    detected_intent: Mapped[str] = mapped_column(String(32), nullable=False, default="unknown")
    intent_confidence: Mapped[float | None] = mapped_column(Float, nullable=True)
    story_patch: Mapped[dict] = mapped_column(JSON, default=dict)
    assistant_text: Mapped[str | None] = mapped_column(Text, nullable=True)
    assistant_audio_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
    assistant_audio_duration_ms: Mapped[int | None] = mapped_column(Integer, nullable=True)
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), index=True
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )


class VoiceSessionEvent(Base):
    __tablename__ = "voice_session_events"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    session_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("voice_sessions.id", ondelete="CASCADE"), nullable=False, index=True
    )
    turn_id: Mapped[str | None] = mapped_column(
        String(36), ForeignKey("voice_turns.id", ondelete="SET NULL"), nullable=True, index=True
    )
    event_type: Mapped[str] = mapped_column(String(64), nullable=False)
    status: Mapped[str] = mapped_column(String(32), nullable=False)
    message: Mapped[str | None] = mapped_column(Text, nullable=True)
    event_metadata: Mapped[dict] = mapped_column(JSON, default=dict)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), index=True
    )

6. Pydantic Schema 草图

建议新文件：backend/app/schemas/voice_session_schemas.py

6.1 常量建议

MAX_VOICE_TRANSCRIPT_LENGTH = 1000
MAX_VOICE_TARGET_MODE = ("story",)
MAX_TURN_DURATION_MS = 90_000

6.2 Request Schemas

from datetime import datetime
from typing import Any, Literal

from pydantic import BaseModel, Field


class VoiceSessionCreateRequest(BaseModel):
    child_profile_id: str | None = None
    universe_id: str | None = None
    target_mode: Literal["story"] = Field(default="story")


class VoiceTurnCreateFallbackRequest(BaseModel):
    transcript_text: str = Field(..., min_length=1, max_length=1000)
    duration_ms: int | None = Field(default=None, ge=1, le=90_000)


class VoiceSessionFinalizeRequest(BaseModel):
    save_story: bool = True
    generate_cover: bool = True
    generate_final_audio: bool = False


class VoiceSessionAbandonRequest(BaseModel):
    reason: str | None = Field(default=None, max_length=200)

6.3 Response Schemas

class VoiceSessionEventResponse(BaseModel):
    id: int
    session_id: str
    turn_id: str | None = None
    event_type: str
    status: str
    message: str | None = None
    event_metadata: dict[str, Any] = Field(default_factory=dict)
    created_at: datetime


class VoiceTurnSummaryResponse(BaseModel):
    id: str
    session_id: str
    turn_index: int
    status: str
    user_transcript: str | None = None
    transcript_confidence: float | None = None
    detected_intent: str
    intent_confidence: float | None = None
    assistant_text: str | None = None
    assistant_audio_ready: bool = False
    assistant_audio_url: str | None = None
    error_message: str | None = None
    created_at: datetime
    updated_at: datetime


class VoiceSessionSummaryResponse(BaseModel):
    id: str
    child_profile_id: str | None = None
    universe_id: str | None = None
    final_story_id: int | None = None
    target_mode: str
    status: str
    current_turn_index: int
    working_title: str | None = None
    story_state: dict[str, Any] = Field(default_factory=dict)
    latest_user_transcript: str | None = None
    latest_assistant_text: str | None = None
    can_continue: bool = False
    can_finalize: bool = False
    last_error: str | None = None
    created_at: datetime
    updated_at: datetime


class VoiceSessionDetailResponse(VoiceSessionSummaryResponse):
    recent_turns: list[VoiceTurnSummaryResponse] = Field(default_factory=list)
    events: list[VoiceSessionEventResponse] = Field(default_factory=list)


class VoiceTurnAcceptedResponse(BaseModel):
    turn_id: str
    session_id: str
    status: str


class VoiceSessionFinalizeResponse(BaseModel):
    session_id: str
    status: str
    story_id: int | None = None
    generation_job_id: str | None = None

7. 路由草图

建议新文件：backend/app/api/voice_sessions.py

7.1 路由清单

创建会话

@router.post("/voice-sessions", response_model=VoiceSessionSummaryResponse, status_code=201)
async def create_voice_session(...)

获取会话详情

@router.get("/voice-sessions/{session_id}", response_model=VoiceSessionDetailResponse)
async def get_voice_session(...)

提交一轮语音

首版建议主接口使用 multipart/form-data：

@router.post(
    "/voice-sessions/{session_id}/turns",
    response_model=VoiceTurnAcceptedResponse,
    status_code=202,
)
async def create_voice_turn(
    session_id: str,
    audio_file: UploadFile = File(...),
    duration_ms: int | None = Form(default=None),
    user: User = Depends(require_user),
    db: AsyncSession = Depends(get_db),
):
    ...

提交一轮文本 fallback

为了开发期调试、桌面浏览器兼容和测试稳定性，建议同步提供：

@router.post(
    "/voice-sessions/{session_id}/turns/fallback",
    response_model=VoiceTurnAcceptedResponse,
    status_code=202,
)
async def create_voice_turn_from_text(...)

获取一轮结果

@router.get(
    "/voice-sessions/{session_id}/turns/{turn_id}",
    response_model=VoiceTurnSummaryResponse,
)
async def get_voice_turn(...)

解决低置信度确认

@router.post(
    "/voice-sessions/{session_id}/turns/{turn_id}/confirm",
    response_model=VoiceTurnSummaryResponse,
)
async def resolve_voice_turn_confirmation(...)

支持：

accept: 按当前理解继续本轮
retry_recording: 撤回当前理解，重新录音
switch_to_text: 撤回当前理解，切换到文本输入

结束并保存

@router.post(
    "/voice-sessions/{session_id}/finalize",
    response_model=VoiceSessionFinalizeResponse,
)
async def finalize_voice_session(...)

获取语音共创 analytics

@router.get("/voice-sessions/analytics", response_model=VoiceSessionAnalyticsResponse)
async def get_voice_session_analytics(...)

放弃会话

@router.post("/voice-sessions/{session_id}/abandon", response_model=VoiceSessionSummaryResponse)
async def abandon_voice_session(...)

8. API 行为语义

8.1 `POST /api/voice-sessions`

Request

{
  "child_profile_id": "profile-id",
  "universe_id": "universe-id",
  "target_mode": "story"
}

Response

{
  "id": "session-id",
  "child_profile_id": "profile-id",
  "universe_id": "universe-id",
  "final_story_id": null,
  "target_mode": "story",
  "status": "draft",
  "current_turn_index": 0,
  "working_title": null,
  "story_state": {},
  "latest_user_transcript": null,
  "latest_assistant_text": null,
  "can_continue": true,
  "can_finalize": false,
  "last_error": null,
  "created_at": "2026-04-19T12:00:00Z",
  "updated_at": "2026-04-19T12:00:00Z"
}

8.2 `POST /api/voice-sessions/{session_id}/turns`

Request

multipart/form-data

audio_file
duration_ms（可选）

Response

{
  "turn_id": "turn-id",
  "session_id": "session-id",
  "status": "received"
}

说明：

这一步只表示本轮已被接收
前端需继续轮询 GET /api/voice-sessions/{session_id}/turns/{turn_id}

8.3 `GET /api/voice-sessions/{session_id}/turns/{turn_id}`

Response

{
  "id": "turn-id",
  "session_id": "session-id",
  "turn_index": 2,
  "status": "audio_ready",
  "user_transcript": "不要让它哭了，给它一个朋友",
  "transcript_confidence": 0.91,
  "detected_intent": "correct_story",
  "intent_confidence": 0.87,
  "assistant_text": "小猫擦了擦眼泪，这时月亮后面飞来了一位会发光的小伙伴。",
  "assistant_audio_ready": true,
  "assistant_audio_url": "/static/voice-sessions/session-id/turn-002-assistant.mp3",
  "error_message": null,
  "created_at": "2026-04-19T12:01:00Z",
  "updated_at": "2026-04-19T12:01:04Z"
}

8.4 `POST /api/voice-sessions/{session_id}/finalize`

Request

{
  "save_story": true,
  "generate_cover": true,
  "generate_final_audio": false
}

Response

{
  "session_id": "session-id",
  "status": "completed",
  "story_id": 123,
  "generation_job_id": "optional-asset-job-id"
}

说明：

story_id 是正式沉淀结果
如果 finalize 后还触发了封面等资产补全，可返回 generation_job_id

9. Service 方法草图

建议新文件：backend/app/services/voice_session_service.py

建议至少包含这些入口：

async def create_voice_session_service(...)
async def get_voice_session_detail_service(...)
async def create_voice_turn_service(...)
async def create_voice_turn_from_text_service(...)
async def get_voice_turn_service(...)
async def finalize_voice_session_service(...)
async def abandon_voice_session_service(...)

10. 错误语义建议

404

session 不存在
turn 不存在

409

session 当前状态不允许继续提交 turn
session 已经 completed / abandoned
finalize 重复提交

422

音频文件缺失
transcript fallback 为空
target_mode 非 Phase A 支持值

503

ASR provider 临时不可用
TTS provider 临时不可用且无法降级

降级语义

ASR 失败：本轮失败，可重试
意图解析失败：本轮标记 unknown，前端提示重说
TTS 失败但文本成功：turn 状态停在 narrative_ready，不让整个 session 失败

11. 事件建议

建议 voice_session_events.event_type 首版支持：

session_created
turn_received
turn_transcribing
turn_transcribed
intent_resolved
story_patch_applied
assistant_text_ready
assistant_audio_ready
assistant_audio_failed
session_finalizing
session_saved_as_story
session_abandoned
session_failed

12. 文件存储草案

建议目录：

storage/voice_sessions/<session_id>/

文件命名

turn-001-user.webm
turn-001-assistant.mp3
turn-002-user.webm
turn-002-assistant.mp3

建议单独封装

backend/app/services/voice_session_storage.py

建议方法：

def session_storage_dir(session_id: str) -> Path
def build_turn_user_audio_path(session_id: str, turn_index: int, suffix: str) -> Path
def build_turn_assistant_audio_path(session_id: str, turn_index: int) -> Path

13. 最小实现顺序

第 1 步

Alembic migration
SQLAlchemy models

第 2 步

voice_session_schemas.py
voice_sessions.py 路由骨架

第 3 步

文本 fallback 路由先通
不依赖真实音频，也能先走完整 session 流程

第 4 步

接入真实音频上传
接入 ASR
接入 TTS

第 5 步

finalize -> Story
复用现有故事库链路

这个顺序的好处是：

先打通状态流
再接真实语音
风险分层最清楚

14. 当前最值得继续的下一步

如果我们要把这份草案继续往前推成真正可编码状态，最合理的下一步不是直接铺开所有实现，而是：

先把 migration 和 SQLAlchemy model skeleton 真正写出来
再把 voice_session_schemas.py 和 voice_sessions.py 的空实现搭起来
先用文本 fallback 跑通整条链路
最后再接真实录音和 ASR

这会比“先做浏览器录音再补后端状态”稳得多。

27 KiB Raw Blame History Unescape Escape

实现草案：语音共创 Phase A 数据迁移与 API Schema

1. 目的

2. 建议变更清单

2.1 新增 Alembic revision

2.2 建议新增后端文件

2.3 建议改动现有文件

3. 数据库迁移草案

3.1 新表：voice_sessions

设计目标

建议字段

建议索引

3.2 新表：voice_turns

设计目标

建议字段

约束与索引建议

3.3 新表：voice_session_events

设计目标

建议字段

建议索引

4. Alembic 迁移草案

5. SQLAlchemy Model 草图

6. Pydantic Schema 草图

6.1 常量建议

6.2 Request Schemas

6.3 Response Schemas

7. 路由草图

7.1 路由清单

创建会话

获取会话详情

提交一轮语音

提交一轮文本 fallback

获取一轮结果

解决低置信度确认

结束并保存

获取语音共创 analytics

放弃会话

8. API 行为语义

8.1 POST /api/voice-sessions

Request

Response

8.2 POST /api/voice-sessions/{session_id}/turns

Request

Response

8.3 GET /api/voice-sessions/{session_id}/turns/{turn_id}

Response

8.4 POST /api/voice-sessions/{session_id}/finalize

Request

Response

9. Service 方法草图

推荐内部 helper

10. 错误语义建议

404

409

422

503

降级语义

11. 事件建议

12. 文件存储草案

文件命名

建议单独封装

13. 最小实现顺序

第 1 步

第 2 步

第 3 步

第 4 步

第 5 步

14. 当前最值得继续的下一步

27 KiB

Raw Blame History

3.1 新表：`voice_sessions`

3.2 新表：`voice_turns`

3.3 新表：`voice_session_events`

8.1 `POST /api/voice-sessions`

8.2 `POST /api/voice-sessions/{session_id}/turns`

8.3 `GET /api/voice-sessions/{session_id}/turns/{turn_id}`

8.4 `POST /api/voice-sessions/{session_id}/finalize`