feat(db): phone_call.record_media_hash 列 + 迁移（录音本地化 FK→Media）

Co-Authored-By: Claude <noreply@anthropic.com>

yunke-server/app/db/models.py

@@ -456,6 +456,11 @@ class PhoneCall(Base):
     sim_number: Mapped[str | None] = mapped_column(String(64), nullable=True)
     imei: Mapped[str | None] = mapped_column(String(128), nullable=True)
     record_file: Mapped[str | None] = mapped_column(String(1024), nullable=True)
+    # sha256 media_hash of the localized recording blob (FK -> Media.media_hash);
+    # NULL until sync_call_recordings downloads it. Populated by the
+    # call_recordings sync pass; playback prefers /api/media/{this} over the
+    # OSS record_file URL.
+    record_media_hash: Mapped[str | None] = mapped_column(String(64), nullable=True)
     is_upload: Mapped[bool | None] = mapped_column(Boolean, nullable=True)
     download_count: Mapped[int | None] = mapped_column(Integer, nullable=True)
     ai_asr: Mapped[str | None] = mapped_column(Text, nullable=True)

yunke-server/migrations/versions/8c4f1d2a9e6b_phone_call_record_media_hash.py

@@ -0,0 +1,30 @@
+"""phone_call record_media_hash
+
+Revision ID: 8c4f1d2a9e6b
+Revises: 3892dbfab839
+Create Date: 2026-08-07 00:00:00.000000
+
+"""
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision: str = '8c4f1d2a9e6b'
+down_revision: str | Sequence[str] | None = '3892dbfab839'
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    with op.batch_alter_table('phone_call', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('record_media_hash', sa.String(length=64), nullable=True))
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    with op.batch_alter_table('phone_call', schema=None) as batch_op:
+        batch_op.drop_column('record_media_hash')