-- §4: the metadata cache. Reconstructible from Gitea at any time by the
-- §4.1 reconciler; never written from user actions, only from webhook
-- handlers and reconciler sweeps. Body content is cached for main-branch
-- reads (§4 #3); branch bodies are not.
--
-- These tables are not in §5's "canonical app tables" list because they
-- are cache, not truth — but they are required for the left-pane render
-- path and for serving super-draft and main-branch bodies without a
-- Gitea round-trip on every navigation.

-- One row per meta-repo rfcs/<slug>.md entry. Mirrors §2.1 frontmatter
-- plus the cached body for super-draft preview (graduated entries have
-- frontmatter-only bodies per §13.3 step 3, but the field is reused).
CREATE TABLE cached_rfcs (
    slug                TEXT PRIMARY KEY,
    title               TEXT NOT NULL,
    state               TEXT NOT NULL CHECK (state IN ('super-draft', 'active', 'withdrawn')),
    rfc_id              TEXT,                -- 'RFC-NNNN' or NULL until graduated
    repo                TEXT,                -- 'org/repo' or NULL until graduated
    proposed_by         TEXT,                -- gitea login or email
    proposed_at         TEXT,
    graduated_at        TEXT,
    graduated_by        TEXT,
    owners_json         TEXT NOT NULL DEFAULT '[]',
    arbiters_json       TEXT NOT NULL DEFAULT '[]',
    tags_json           TEXT NOT NULL DEFAULT '[]',
    body                TEXT,                -- super-draft body or main RFC.md body
    body_sha            TEXT,                -- the commit sha the body was fetched at
    last_main_commit_at TEXT,                -- §7.1's "Recently active" sort
    last_entry_commit_at TEXT,               -- last meta-repo commit touching this entry
    updated_at          TEXT NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX idx_cached_rfcs_state ON cached_rfcs (state);
CREATE INDEX idx_cached_rfcs_last_active ON cached_rfcs (
    COALESCE(last_main_commit_at, last_entry_commit_at) DESC
);

-- One row per branch the bot knows about on either a per-RFC repo
-- (rfc_slug, state='active'') or on the meta repo as a super-draft edit
-- branch (rfc_slug, state='super-draft', branch_name like 'edit/<slug>/...').
-- §11.5: closed branches stay; deleted branches keep their metadata row
-- per §12 ("branch removed from Gitea, row remains").
CREATE TABLE cached_branches (
    id              INTEGER PRIMARY KEY AUTOINCREMENT,
    rfc_slug        TEXT NOT NULL,
    branch_name     TEXT NOT NULL,
    head_sha        TEXT,
    state           TEXT NOT NULL DEFAULT 'open' CHECK (state IN ('open', 'closed', 'deleted')),
    pinned          INTEGER NOT NULL DEFAULT 0,
    created_at      TEXT NOT NULL DEFAULT (datetime('now')),
    last_commit_at  TEXT,
    closed_at       TEXT,
    UNIQUE (rfc_slug, branch_name)
);

CREATE INDEX idx_cached_branches_rfc ON cached_branches (rfc_slug, state);

-- One row per PR the bot knows about. Includes meta-repo idea PRs (rfc_slug
-- carries the proposed slug, see §5 super-draft scoping note) and meta-repo
-- body-edit PRs and per-RFC-repo PRs. The pr_kind disambiguates.
CREATE TABLE cached_prs (
    id              INTEGER PRIMARY KEY AUTOINCREMENT,
    rfc_slug        TEXT NOT NULL,
    pr_kind         TEXT NOT NULL CHECK (pr_kind IN ('idea', 'meta_body_edit', 'meta_metadata', 'meta_claim', 'rfc_branch')),
    repo            TEXT NOT NULL,                -- 'org/repo' the PR lives on
    pr_number       INTEGER NOT NULL,
    title           TEXT NOT NULL,
    description     TEXT,
    state           TEXT NOT NULL CHECK (state IN ('open', 'merged', 'closed', 'withdrawn')),
    opened_by       TEXT,                          -- gitea login (resolved from On-behalf-of trailer where present)
    opened_at       TEXT,
    merged_at       TEXT,
    closed_at       TEXT,
    head_branch     TEXT,
    base_branch     TEXT NOT NULL DEFAULT 'main',
    head_sha        TEXT,
    UNIQUE (repo, pr_number)
);

CREATE INDEX idx_cached_prs_rfc ON cached_prs (rfc_slug, state);
CREATE INDEX idx_cached_prs_kind ON cached_prs (pr_kind, state);