-- Ledgerline schema. Idempotent: safe to run against an existing database.
-- Index policy is deliberate -- see docs/phase-0-base-project-spec.md §5.
-- Do NOT add transactions(account_id, created_at) or transactions(category_id)
-- here; those live in db/optional_indexes.sql, applied only by `make fix-index`.

CREATE EXTENSION IF NOT EXISTS pg_stat_statements;

CREATE TABLE IF NOT EXISTS accounts (
    id              UUID PRIMARY KEY,
    holder_name     TEXT NOT NULL,
    currency        CHAR(3) NOT NULL,
    balance_minor   BIGINT NOT NULL,
    is_hot          BOOLEAN NOT NULL DEFAULT FALSE,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS merchant_categories (
    id              SMALLINT PRIMARY KEY,
    code            TEXT NOT NULL UNIQUE,
    label           TEXT NOT NULL,
    risk_weight     NUMERIC(3,2) NOT NULL
);

CREATE TABLE IF NOT EXISTS transactions (
    id              UUID PRIMARY KEY,
    account_id      UUID NOT NULL,
    kind            TEXT NOT NULL,
    amount_minor    BIGINT NOT NULL,
    currency        CHAR(3),
    merchant_name   TEXT,
    category_id     SMALLINT,
    status          TEXT NOT NULL,
    risk_score      NUMERIC(4,3),
    created_at      TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- Parallel workers otherwise let a plain sequential scan of this table
-- compete with an index scan on raw CPU parallelism for higher-selectivity
-- accounts (e.g. the 5 hot ones, each ~6-8% of all rows) -- masking exactly
-- the missing-index pathology this table's index policy (README §5) exists
-- to demonstrate. Scoped to this one table, not a database-wide setting.
ALTER TABLE transactions SET (parallel_workers = 0);

CREATE TABLE IF NOT EXISTS sanctions_entries (
    id              SERIAL PRIMARY KEY,
    normalized_name TEXT NOT NULL,
    country         CHAR(2),
    list_source     TEXT,
    added_at        TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE TABLE IF NOT EXISTS notifications (
    id              UUID PRIMARY KEY,
    transaction_id  UUID NOT NULL,
    channel         TEXT NOT NULL,
    status          TEXT NOT NULL,
    attempts        INT NOT NULL DEFAULT 0,
    sent_at         TIMESTAMPTZ
);

CREATE TABLE IF NOT EXISTS audit_events (
    id              BIGSERIAL PRIMARY KEY,
    transaction_id  UUID NOT NULL,
    event_type      TEXT NOT NULL,
    payload         JSONB,
    recorded_at     TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- Not part of the base spec's domain model: a single-row table the seed
-- script writes its summary manifest into, so both `scripts/smoke.py` and
-- the test suite can read back what a given seed run actually produced
-- (row counts, hot/sanctioned/poison account ids, the SEED value used)
-- without re-deriving it via ad-hoc queries.
CREATE TABLE IF NOT EXISTS seed_manifest (
    id      SMALLINT PRIMARY KEY DEFAULT 1,
    data    JSONB NOT NULL
);

CREATE INDEX IF NOT EXISTS accounts_holder_name_idx ON accounts (holder_name);
CREATE INDEX IF NOT EXISTS sanctions_entries_normalized_name_idx ON sanctions_entries (normalized_name);