-- The consolidated schema of the knowledge base: what a fresh database is given at once, and what every
-- migration in migrations/ applied in order comes to (the test TestTheConsolidatedSchemaIsTheMigrationsApplied
-- holds the two equal). Consolidated through migration 0001.

create table record (
    kind            text        not null check (kind in ('decision', 'research')),
    number          integer     not null check (number > 0),
    status          text        not null,
    topic           text        not null default '',
    current_version integer     not null,
    pending_version integer,
    revision        bigint      not null default 1,
    search          tsvector    not null default ''::tsvector,
    primary key (kind, number)
);

create index record_search on record using gin (search);
create index record_topic on record (topic);

create table version (
    kind    text        not null,
    number  integer     not null,
    n       integer     not null check (n > 0),
    by      text        not null,
    at      timestamptz not null,
    why     text        not null,
    insight boolean     not null default false,
    body    jsonb       not null,
    primary key (kind, number, n),
    foreign key (kind, number) references record (kind, number)
);

create table clause (
    kind   text     not null,
    number integer  not null,
    n      integer  not null check (n > 0),
    text   text     not null,
    status text     not null,
    source text     not null,
    search tsvector not null,
    primary key (kind, number, n),
    foreign key (kind, number) references record (kind, number)
);

create index clause_search on clause using gin (search);

create table link (
    from_kind   text    not null,
    from_number integer not null,
    from_clause integer not null default 0,
    kind        text    not null,
    to_kind     text    not null,
    to_number   integer not null default 0,
    to_clause   integer not null default 0,
    to_path     text    not null default '',
    body        jsonb   not null,
    foreign key (from_kind, from_number) references record (kind, number)
);

create index link_from on link (from_kind, from_number);
create index link_to on link (to_kind, to_number);

create table finding (
    rule    text        not null,
    records text[]      not null,
    says    text        not null,
    at      timestamptz not null
);

create table told (
    topic text        primary key,
    at    timestamptz not null default now()
);