Fix upgrade script

upgrades/2.55.0-2.56.0.sql

@@ -3,6 +3,28 @@
 ---
 UPDATE enum_parameters SET val = '2.56.0' WHERE id = 1;
 
+CREATE TABLE domain_auction (
+        id BIGSERIAL CONSTRAINT domain_auction_pkey PRIMARY KEY,
+        fqdn VARCHAR(255) NOT NULL CONSTRAINT domain_auction_fqdn_lower_check CHECK(LOWER(fqdn) = fqdn),
+        created_at TIMESTAMP WITHOUT TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        finished_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
+        external_id VARCHAR(255) CONSTRAINT domain_auction_external_id_key UNIQUE,
+        next_event_after TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
+        winner_id INTEGER DEFAULT NULL CONSTRAINT domain_auction_winner_id_fkey REFERENCES object_registry(id),
+        win_expires_at TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL);
+
+CREATE UNIQUE INDEX domain_auction_fqdn_unique ON domain_auction(fqdn) WHERE finished_at IS NULL;
+
+COMMENT ON TABLE domain_auction IS
+'This table contains information about the progress of domain auction';
+COMMENT ON COLUMN domain_auction.id IS 'unique automatically generated identifier';
+COMMENT ON COLUMN domain_auction.fqdn IS 'auctioned domain fully qualified name';
+COMMENT ON COLUMN domain_auction.created_at IS 'auction creation time';
+COMMENT ON COLUMN domain_auction.finished_at IS 'auction end time';
+COMMENT ON COLUMN domain_auction.external_id IS 'external auction identifier';
+COMMENT ON COLUMN domain_auction.next_event_after IS 'the earliest event can occur in this auction';
+COMMENT ON COLUMN domain_auction.winner_id IS 'contact who is allowed to register a domain until win_expires_at';
+COMMENT ON COLUMN domain_auction.win_expires_at IS 'the latest time by which the winner has to register the domain';
 
 ALTER TABLE zone
       ADD COLUMN IF NOT EXISTS auction_enabled BOOLEAN NOT NULL DEFAULT FALSE;