98 lines
3.5 KiB
Python
98 lines
3.5 KiB
Python
"""chat stats last deleted
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Revision ID: f1c4a8e2d6b3
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Revises: d8f1a6c3e5b7
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Create Date: 2026-10-19 04:00:00.000000
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"""
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from collections.abc import Sequence
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from alembic import op
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revision: str = "f1c4a8e2d6b3"
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down_revision: str | None = "d8f1a6c3e5b7"
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branch_labels: str | Sequence[str] | None = None
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depends_on: str | Sequence[str] | None = None
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_APPLY = """
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CREATE OR REPLACE FUNCTION chat_stats_apply() RETURNS trigger LANGUAGE plpgsql AS $$
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BEGIN
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IF TG_OP = 'INSERT' THEN
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INSERT INTO chat_stats AS cs (account_id, chat_id, message_count,
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last_date, last_message_id,
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last_text, last_sender_id{column})
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VALUES (NEW.account_id, NEW.chat_id, 1,
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CASE WHEN NEW.date <= now() + interval '1 day'
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THEN NEW.date END,
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CASE WHEN NEW.date <= now() + interval '1 day'
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THEN NEW.message_id END,
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NEW.text, NEW.sender_id{value})
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ON CONFLICT (account_id, chat_id) DO UPDATE SET
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message_count = cs.message_count + 1,
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last_date = CASE WHEN chat_stats_newer(cs, EXCLUDED)
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THEN EXCLUDED.last_date ELSE cs.last_date END,
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last_message_id = CASE WHEN chat_stats_newer(cs, EXCLUDED)
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THEN EXCLUDED.last_message_id
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ELSE cs.last_message_id END,
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last_text = CASE WHEN chat_stats_newer(cs, EXCLUDED)
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THEN EXCLUDED.last_text ELSE cs.last_text END,
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last_sender_id = CASE WHEN chat_stats_newer(cs, EXCLUDED)
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THEN EXCLUDED.last_sender_id
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ELSE cs.last_sender_id END{merge};
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ELSE
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UPDATE chat_stats
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SET last_text = NEW.text, last_sender_id = NEW.sender_id{update}
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WHERE account_id = NEW.account_id
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AND chat_id = NEW.chat_id
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AND last_message_id = NEW.message_id;
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END IF;
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RETURN NULL;
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END;
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$$
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"""
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_DELETED_PARTS = {
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"column": ", last_deleted",
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"value": ", NEW.deleted_at IS NOT NULL",
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"merge": (
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",\n last_deleted = CASE WHEN chat_stats_newer(cs, EXCLUDED)"
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" THEN EXCLUDED.last_deleted ELSE cs.last_deleted END"
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),
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"update": ", last_deleted = NEW.deleted_at IS NOT NULL",
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"deleted": " OR OLD.deleted_at IS DISTINCT FROM NEW.deleted_at",
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}
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_PLAIN_PARTS = dict.fromkeys(_DELETED_PARTS, "")
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_UPDATE_TRIGGER = (
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"CREATE TRIGGER messages_chat_stats_update AFTER UPDATE ON messages "
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"FOR EACH ROW WHEN (OLD.text IS DISTINCT FROM NEW.text "
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"OR OLD.sender_id IS DISTINCT FROM NEW.sender_id{deleted}) "
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"EXECUTE FUNCTION chat_stats_apply()"
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)
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_BACKFILL = """
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UPDATE chat_stats cs SET last_deleted = true
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FROM messages m
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WHERE m.account_id = cs.account_id AND m.chat_id = cs.chat_id
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AND m.message_id = cs.last_message_id AND m.date = cs.last_date
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AND m.deleted_at IS NOT NULL
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"""
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def upgrade() -> None:
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op.execute(
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"ALTER TABLE chat_stats ADD COLUMN last_deleted boolean NOT NULL DEFAULT false"
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)
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op.execute(_BACKFILL)
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op.execute(_APPLY.format(**_DELETED_PARTS))
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op.execute("DROP TRIGGER IF EXISTS messages_chat_stats_update ON messages")
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op.execute(_UPDATE_TRIGGER.format(**_DELETED_PARTS))
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def downgrade() -> None:
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op.execute("DROP TRIGGER IF EXISTS messages_chat_stats_update ON messages")
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op.execute(_UPDATE_TRIGGER.format(**_PLAIN_PARTS))
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op.execute(_APPLY.format(**_PLAIN_PARTS))
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op.execute("ALTER TABLE chat_stats DROP COLUMN last_deleted")
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