-- Initial pf schema: sources, column metadata, versions, audit log, generated SQL.
--
-- This is the schema as it stood before the additive columns in later migrations.
-- Columns added afterwards are declared once, in their own migration — not here.

CREATE SCHEMA IF NOT EXISTS pf;

CREATE TABLE pf.source (
    id         serial PRIMARY KEY,
    schema     text NOT NULL,
    tname      text NOT NULL,
    label      text,
    status     text NOT NULL DEFAULT 'active',  -- active | archived
    created_at timestamptz NOT NULL DEFAULT now(),
    created_by text,
    UNIQUE (schema, tname)
);

CREATE TABLE pf.col_meta (
    id        serial PRIMARY KEY,
    source_id integer NOT NULL REFERENCES pf.source(id) ON DELETE CASCADE,
    cname     text NOT NULL,
    label     text,
    role      text NOT NULL DEFAULT 'ignore',   -- dimension | value | units | date | filter | ignore
    is_key    boolean NOT NULL DEFAULT false,   -- true = usable in WHERE slice
    opos      integer,
    UNIQUE (source_id, cname)
);

CREATE TABLE pf.version (
    id            serial PRIMARY KEY,
    source_id     integer NOT NULL REFERENCES pf.source(id) ON DELETE RESTRICT,
    name          text NOT NULL,
    description   text,
    status        text NOT NULL DEFAULT 'open',  -- open | closed
    exclude_iters jsonb NOT NULL DEFAULT '["reference"]'::jsonb,
    created_at    timestamptz NOT NULL DEFAULT now(),
    created_by    text,
    closed_at     timestamptz,
    closed_by     text,
    UNIQUE (source_id, name)
);

CREATE TABLE pf.log (
    id         bigserial PRIMARY KEY,
    version_id integer NOT NULL REFERENCES pf.version(id) ON DELETE CASCADE,
    pf_user    text NOT NULL,
    stamp      timestamptz NOT NULL DEFAULT now(),
    operation  text NOT NULL,   -- baseline | reference | scale | recode | clone
    slice      jsonb,
    params     jsonb,
    note       text
);

-- generated operation SQL per source, stored after col_meta is configured
CREATE TABLE pf.sql (
    id           serial PRIMARY KEY,
    source_id    integer NOT NULL REFERENCES pf.source(id) ON DELETE CASCADE,
    operation    text NOT NULL,  -- get_data | get_agg | baseline | reference | scale | recode | clone | undo
    sql          text NOT NULL,
    generated_at timestamptz NOT NULL DEFAULT now(),
    UNIQUE (source_id, operation)
);