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1CREATE TABLE plc_operation_tokens ( 2 id UUID PRIMARY KEY DEFAULT gen_random_uuid(), 3 user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE, 4 token TEXT NOT NULL UNIQUE, 5 expires_at TIMESTAMPTZ NOT NULL, 6 created_at TIMESTAMPTZ NOT NULL DEFAULT NOW() 7); 8 9CREATE INDEX idx_plc_op_tokens_user ON plc_operation_tokens(user_id); 10CREATE INDEX idx_plc_op_tokens_expires ON plc_operation_tokens(expires_at);