feat: add waveform voice messages end-to-end

alembic/versions/0020_attachment_waveform_data.py

@@ -0,0 +1,27 @@
+"""add waveform data to attachments
+
+Revision ID: 0020_attachment_waveform_data
+Revises: 0019_user_privacy_fields
+Create Date: 2026-03-08
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = "0020_attachment_waveform_data"
+down_revision: str | None = "0019_user_privacy_fields"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.add_column("attachments", sa.Column("waveform_data", sa.Text(), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column("attachments", "waveform_data")
+