CREATE TABLE IF NOT EXISTS operation_requests (
    operation_type TEXT NOT NULL CHECK (operation_type <> '' AND char_length(operation_type) <= 100),
    operation_id TEXT NOT NULL CHECK (operation_id <> '' AND char_length(operation_id) <= 128),
    request_fingerprint_sha256 CHAR(64) NOT NULL CHECK (request_fingerprint_sha256 ~ '^[0-9a-f]{64}$'),
    state TEXT NOT NULL DEFAULT 'completed' CHECK (state IN ('completed')),
    result JSONB NOT NULL,
    created_at TIMESTAMPTZ NOT NULL,
    completed_at TIMESTAMPTZ NOT NULL,
    UNIQUE (operation_type, operation_id)
);