-- Lightning deposits and withdrawals.
--
-- Invoices key on payment_hash, which is what makes crediting idempotent: a
-- node that reports the same settlement twice cannot produce two credits.

CREATE TABLE lightning_invoices (
    payment_hash TEXT PRIMARY KEY,
    account_id   BIGINT NOT NULL REFERENCES accounts(id),
    amount_msat  BIGINT NOT NULL CHECK (amount_msat > 0),
    bolt11       TEXT NOT NULL,
    created_at   TIMESTAMPTZ NOT NULL DEFAULT now(),
    expires_at   TIMESTAMPTZ,
    -- Set exactly once, when the payment is credited to the ledger.
    credited_at  TIMESTAMPTZ
);

CREATE INDEX lightning_invoices_account_idx ON lightning_invoices (account_id, created_at DESC);
CREATE INDEX lightning_invoices_pending_idx ON lightning_invoices (created_at)
    WHERE credited_at IS NULL;

CREATE TYPE withdrawal_status AS ENUM
    ('queued', 'needs_approval', 'sending', 'paid', 'failed', 'rejected');

CREATE TABLE lightning_withdrawals (
    id           BIGSERIAL PRIMARY KEY,
    account_id   BIGINT NOT NULL REFERENCES accounts(id),
    bolt11       TEXT NOT NULL,
    amount_msat  BIGINT NOT NULL CHECK (amount_msat > 0),
    status       withdrawal_status NOT NULL,
    payment_hash TEXT,
    fee_msat     BIGINT,
    failure      TEXT,
    created_at   TIMESTAMPTZ NOT NULL DEFAULT now(),
    resolved_at  TIMESTAMPTZ
);

CREATE INDEX lightning_withdrawals_account_idx ON lightning_withdrawals (account_id, id DESC);
CREATE INDEX lightning_withdrawals_pending_idx ON lightning_withdrawals (id)
    WHERE status IN ('queued', 'needs_approval', 'sending');