server: add participant API

Also break out views into different files for easier reading

server/migrations/versions/125031f7cb78_participants.py

@@ -0,0 +1,30 @@
+"""participants
+
+Revision ID: 125031f7cb78
+Revises: 0fea6d96b096
+Create Date: 2023-11-30 15:56:03.341466
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '125031f7cb78'
+down_revision: Union[str, None] = '0fea6d96b096'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('transcript', sa.Column('participants', sa.JSON(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('transcript', 'participants')
+    # ### end Alembic commands ###