CREATE TABLE flows (
    id UUID NOT NULL PRIMARY KEY DEFAULT gen_random_uuid(),
    "started" timestamptz NOT NULL DEFAULT current_timestamp,
    kind TEXT NOT NULL,
    input UUID[],
    ended timestamptz,
    "next" UUID,
    produced UUID[],
    FOREIGN KEY("next") REFERENCES flows(id)
);

CREATE TABLE flow_notes (
    id UUID NOT NULL PRIMARY KEY DEFAULT gen_random_uuid(),
    time timestamptz NOT NULL DEFAULT current_timestamp,
    content TEXT NOT NULL,
    on_flow UUID NOT NULL,
    FOREIGN KEY(on_flow) REFERENCES flows(id)
);

CREATE TABLE transactions (
    id UUID NOT NULL PRIMARY KEY DEFAULT gen_random_uuid(),
    created timestamptz NOT NULL DEFAULT current_timestamp,
    item TEXT NOT NULL,
    variant TEXT NOT NULL,
    price DOUBLE PRECISION,
    origin TEXT,
    "location" TEXT,
    note TEXT,
    destination TEXT,
    consumed_price NUMERIC(2),
    consumed_timestamp timestamptz
);