65 lines
2.8 KiB
Python
65 lines
2.8 KiB
Python
"""Track channel delivery receipts on chat_history
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WhatsApp reports sent / delivered / read / failed for every message we send,
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keyed by its platform message id (wamid). Storing that id on the row is what
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lets a receipt find its message; channel_status holds the latest receipt.
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channel_status is deliberately separate from attributes.delivery_status: the
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inbox reads any delivery_status as "not delivered", so a 'read' written there
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would show as a failure.
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Revision ID: chat_channel_status_001
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Revises: idx_kq_org_status_001
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Create Date: 2026-10-11
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"""
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from typing import Sequence, Union
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import sqlalchemy as sa
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from alembic import op
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# revision identifiers, used by Alembic.
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# Keep revision ids under 32 characters: alembic_version.version_num is
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# varchar(32).
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revision: str = 'chat_channel_status_001'
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down_revision: Union[str, None] = 'idx_kq_org_status_001'
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branch_labels: Union[str, Sequence[str], None] = None
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depends_on: Union[str, Sequence[str], None] = None
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INDEX_NAME = 'ix_chat_history_org_external_message'
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def upgrade() -> None:
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# if_not_exists throughout: the columns commit before the index builds
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# (CONCURRENTLY can't share their transaction), so a start that dies
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# mid-build must be able to run this again.
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op.add_column('chat_history', sa.Column('external_message_id', sa.String(), nullable=True),
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if_not_exists=True)
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op.add_column('chat_history', sa.Column('channel_status', sa.String(16), nullable=True),
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if_not_exists=True)
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op.add_column('chat_history', sa.Column('channel_status_at', sa.TIMESTAMP(timezone=True),
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nullable=True),
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if_not_exists=True)
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# Partial: only channel messages carry an id, so widget rows stay out of it.
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# Built CONCURRENTLY so a large chat_history keeps taking writes while it
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# builds — migrations run on backend start. That can't run in a
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# transaction, hence the autocommit block. A build that fails part-way
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# leaves an INVALID index that IF NOT EXISTS would then skip: if that
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# happens, DROP INDEX ix_chat_history_org_external_message and restart.
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with op.get_context().autocommit_block():
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op.create_index(
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INDEX_NAME, 'chat_history', ['organization_id', 'external_message_id'],
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unique=False,
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postgresql_where=sa.text('external_message_id IS NOT NULL'),
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postgresql_concurrently=True,
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if_not_exists=True,
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)
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def downgrade() -> None:
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with op.get_context().autocommit_block():
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op.drop_index(INDEX_NAME, table_name='chat_history',
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postgresql_concurrently=True, if_exists=True)
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op.drop_column('chat_history', 'channel_status_at', if_exists=True)
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op.drop_column('chat_history', 'channel_status', if_exists=True)
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op.drop_column('chat_history', 'external_message_id', if_exists=True)
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