-- Runic Gateway database schema (MariaDB)
-- Run automatically by the MariaDB container (docker-entrypoint-initdb.d) on a
-- fresh volume, and idempotently by ensureSchema() on every server boot.
--
-- CORE ONLY. The 27 shard_* / uo_link_* tables left with module-uo in Phase 3
-- and live in its schema fragment, which core replays immediately after this
-- file (MODULE_API.md 2.6). Two of them carry a foreign key INTO users, which
-- is why that order matters and why the reverse -- a core table referencing a
-- module table -- must never appear here: it would make core unable to boot
-- without a module installed.

CREATE TABLE IF NOT EXISTS users (
  id            INT AUTO_INCREMENT PRIMARY KEY,
  -- COLLATE is pinned to a case-insensitive (_ci) collation so uniqueness and
  -- findByUsername lookups both fold case identically ('Foo' == 'foo'). This is
  -- the atomic backstop for the username-uniqueness race (see the register /
  -- change-username duplicate-key handling).
  username      VARCHAR(32)  NOT NULL COLLATE utf8mb4_general_ci UNIQUE,
  -- Nullable: SSO-provisioned players have no password until they choose to set
  -- one. A NULL hash means password login is impossible for that account
  -- (validatePassword returns false).
  password_hash VARCHAR(72)  NULL,
  role          ENUM('admin','editor','moderator','player') NOT NULL DEFAULT 'admin',
  -- Optional contact email (players). Not unique — SSO emails may repeat. Used
  -- only for display + a future self-serve reset. email_verified is wired now so
  -- an eventual SMTP verification flow needs no schema change.
  email         VARCHAR(255) NULL,
  email_verified TINYINT(1)  NOT NULL DEFAULT 0,
  -- Account lifecycle, independent of role: staff can disable/ban a player
  -- without changing their role. active = normal; disabled = admin-locked;
  -- banned = moderation ban; pending = reserved for future email-verify gating.
  -- Enforced in requireAuth + login (non-active is rejected).
  status        ENUM('active','pending','disabled','banned') NOT NULL DEFAULT 'active',
  totp_secret   VARCHAR(64)  NULL,          -- base32 TOTP secret (opt-in 2FA)
  totp_enabled  TINYINT(1)   NOT NULL DEFAULT 0,
  -- Any session token issued before this instant is rejected (see requireAuth).
  -- Bumped on password change / "log out everywhere". NULL = no cutoff yet.
  tokens_valid_after DATETIME NULL,
  created_at    DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  last_login_at DATETIME NULL,
  last_login_ip VARCHAR(45)  NULL           -- IPv6-capable, set on each login
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS posts (
  id           INT AUTO_INCREMENT PRIMARY KEY,
  category     ENUM('news','five_on_friday','newsletter','screenshot') NOT NULL,
  title        VARCHAR(200) NOT NULL,
  slug         VARCHAR(220) NULL,
  excerpt      VARCHAR(400) NULL,
  body         MEDIUMTEXT   NULL,
  image_url    VARCHAR(500) NULL,
  published    TINYINT(1)   NOT NULL DEFAULT 0,
  author_id    INT NULL,
  created_at   DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at   DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  published_at DATETIME NULL,
  CONSTRAINT fk_posts_author FOREIGN KEY (author_id) REFERENCES users(id) ON DELETE SET NULL,
  INDEX idx_posts_feed (category, published, published_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Wiki categories / sections. Defined before wiki_pages so the FK resolves on a
-- fresh install. Pages reference a category (nullable = "Uncategorized").
CREATE TABLE IF NOT EXISTS wiki_categories (
  id          INT AUTO_INCREMENT PRIMARY KEY,
  slug        VARCHAR(120) NOT NULL UNIQUE,
  title       VARCHAR(200) NOT NULL,
  description VARCHAR(400) NULL,
  sort_order  INT NOT NULL DEFAULT 0,
  created_at  DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at  DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS wiki_pages (
  id           INT AUTO_INCREMENT PRIMARY KEY,
  slug         VARCHAR(120) NOT NULL UNIQUE,
  title        VARCHAR(200) NOT NULL,
  body         MEDIUMTEXT   NULL,
  excerpt      VARCHAR(400) NULL,
  category_id  INT NULL,
  published    TINYINT(1)   NOT NULL DEFAULT 1,
  sort_order   INT NOT NULL DEFAULT 0,
  updated_by   INT NULL,
  created_at   DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at   DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  published_at DATETIME NULL,
  CONSTRAINT fk_wiki_user FOREIGN KEY (updated_by) REFERENCES users(id) ON DELETE SET NULL,
  CONSTRAINT fk_wiki_category FOREIGN KEY (category_id) REFERENCES wiki_categories(id) ON DELETE SET NULL,
  FULLTEXT INDEX idx_wiki_search (title, body)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Wiki tags (many-to-many with pages).
CREATE TABLE IF NOT EXISTS wiki_tags (
  id    INT AUTO_INCREMENT PRIMARY KEY,
  slug  VARCHAR(120) NOT NULL UNIQUE,
  label VARCHAR(120) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS wiki_page_tags (
  page_id INT NOT NULL,
  tag_id  INT NOT NULL,
  PRIMARY KEY (page_id, tag_id),
  CONSTRAINT fk_wpt_page FOREIGN KEY (page_id) REFERENCES wiki_pages(id) ON DELETE CASCADE,
  CONSTRAINT fk_wpt_tag  FOREIGN KEY (tag_id)  REFERENCES wiki_tags(id)  ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Internal-link index, rebuilt on each save. target_slug may point at a page
-- that does not exist yet (a "red link").
CREATE TABLE IF NOT EXISTS wiki_links (
  source_page_id INT NOT NULL,
  target_slug    VARCHAR(120) NOT NULL,
  CONSTRAINT fk_wiki_links_src FOREIGN KEY (source_page_id) REFERENCES wiki_pages(id) ON DELETE CASCADE,
  INDEX idx_wiki_links_target (target_slug)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Per-save content snapshots for history / diff / restore.
CREATE TABLE IF NOT EXISTS wiki_revisions (
  id          INT AUTO_INCREMENT PRIMARY KEY,
  page_id     INT NOT NULL,
  title       VARCHAR(200) NOT NULL,
  body        MEDIUMTEXT NULL,
  excerpt     VARCHAR(400) NULL,
  category_id INT NULL,
  editor_id   INT NULL,
  change_note VARCHAR(280) NULL,
  created_at  DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT fk_wiki_rev_page   FOREIGN KEY (page_id)   REFERENCES wiki_pages(id) ON DELETE CASCADE,
  CONSTRAINT fk_wiki_rev_editor FOREIGN KEY (editor_id) REFERENCES users(id)      ON DELETE SET NULL,
  INDEX idx_wiki_rev_page (page_id, id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS settings (
  `key`      VARCHAR(64) PRIMARY KEY,
  value      TEXT NULL,
  updated_by INT NULL,
  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  CONSTRAINT fk_settings_user FOREIGN KEY (updated_by) REFERENCES users(id) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS activity_log (
  id         INT AUTO_INCREMENT PRIMARY KEY,
  user_id    INT NULL,
  action     VARCHAR(64) NOT NULL,
  detail     TEXT NULL,
  ip         VARCHAR(45) NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT fk_activity_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL,
  INDEX idx_activity_created (created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Pluggable SSO / OAuth2 provider configuration. Rows exist for the built-in
-- providers ('google', 'discord') once an admin configures them, plus any custom
-- OIDC/OAuth2 providers (id = a slug). Client secrets are stored ENCRYPTED
-- (client_secret_enc) and are never returned to a client. Built-in providers
-- hardcode their endpoint URLs in code; the *_url columns are used only by
-- custom (oidc/oauth2) providers.
CREATE TABLE IF NOT EXISTS auth_providers (
  id                VARCHAR(64) PRIMARY KEY,   -- 'google' | 'discord' | custom slug
  kind              ENUM('google','discord','oidc','oauth2') NOT NULL,
  name              VARCHAR(80)  NOT NULL,
  enabled           TINYINT(1)   NOT NULL DEFAULT 0,
  client_id         VARCHAR(255) NULL,
  client_secret_enc TEXT         NULL,         -- AES-256-GCM ciphertext, never exposed
  authorize_url     VARCHAR(500) NULL,         -- custom providers only
  token_url         VARCHAR(500) NULL,
  userinfo_url      VARCHAR(500) NULL,
  scopes            VARCHAR(500) NULL,
  priority          INT          NOT NULL DEFAULT 100,
  created_at        DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at        DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Account linking: maps an external SSO identity to an internal user. A login via
-- SSO succeeds only if a matching (provider, subject) row exists (link-only —
-- external identities are never auto-provisioned into accounts). UNIQUE(provider,
-- subject) guarantees one external identity maps to exactly one internal user.
CREATE TABLE IF NOT EXISTS user_identities (
  id         INT AUTO_INCREMENT PRIMARY KEY,
  user_id    INT NOT NULL,
  provider   VARCHAR(64)  NOT NULL,            -- matches auth_providers.id
  subject    VARCHAR(191) NOT NULL,            -- external stable user id (sub / discord id)
  email      VARCHAR(255) NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT fk_identity_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  UNIQUE KEY uq_identity_provider_subject (provider, subject),
  INDEX idx_identity_user (user_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Long-lived, revocable refresh tokens for mobile (Android) bearer-token auth.
-- The opaque refresh token is never stored in the clear — only its sha256 hash —
-- so a DB read does not leak usable tokens. Rows are rotated on every refresh
-- (old row revoked, new row inserted) and revoked on logout. Web cookie sessions
-- do NOT use this table; it is purely for the mobile bearer flow.
CREATE TABLE IF NOT EXISTS mobile_refresh_tokens (
  id          INT AUTO_INCREMENT PRIMARY KEY,
  user_id     INT NOT NULL,
  token_hash  CHAR(64)     NOT NULL UNIQUE,   -- sha256 hex of the opaque refresh token
  device_hash VARCHAR(32)  NULL,              -- from sessionService.sessionMeta (best-effort)
  device_name VARCHAR(100) NULL,              -- friendly label the app may send (M9)
  user_agent  VARCHAR(255) NULL,
  created_at  DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  last_used_at DATETIME NULL,                 -- last time this session token was issued/used (M9)
  expires_at  DATETIME NOT NULL,
  revoked_at  DATETIME NULL,
  CONSTRAINT fk_mrt_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  INDEX idx_mrt_user (user_id),
  INDEX idx_mrt_expires (expires_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Mobile SSO authorization bridge (M9). Two short-lived, self-pruning tables that
-- bridge a browser SSO redirect flow to the native app. They carry the app↔website
-- PKCE + CSRF state (a SECOND PKCE layer, distinct from the website↔IdP PKCE the
-- sso_tx cookie already carries) and the one-time code the app trades for bearer
-- tokens. No secret is stored in the clear: code_challenge is a hash by construction
-- and the authorization code is stored as a sha256 hash only (same pattern as
-- mobile_refresh_tokens / user_invites / password_resets). See docs BACKEND_DESIGN §3/§4.
CREATE TABLE IF NOT EXISTS mobile_auth_sessions (
  id             INT AUTO_INCREMENT PRIMARY KEY,
  session_id     CHAR(36)     NOT NULL UNIQUE,        -- uuid; carried inside the signed sso_tx (mode 'mobile')
  provider       VARCHAR(40)  NOT NULL,               -- provider id, validated enabled at /start
  code_challenge VARCHAR(255) NOT NULL,               -- app-supplied PKCE S256 challenge (base64url)
  redirect_uri   VARCHAR(255) NOT NULL,               -- app callback; EXACT-match against the allowlist
  state          VARCHAR(255) NOT NULL,               -- app-generated opaque CSRF value, echoed to the app
  status         ENUM('pending','completed','consumed') NOT NULL DEFAULT 'pending',
  user_id        INT          NULL,                   -- set once SSO resolves the account
  trust_device   TINYINT(1)   NOT NULL DEFAULT 0,     -- user ticked "trust this device" on the Custom Tab TOTP form;
                                                      -- a BOOLEAN only — the trust token itself is minted at /exchange
                                                      -- and returned over that app→server call, never stored here
  created_at     DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  expires_at     DATETIME NOT NULL,                   -- ~10 min (one redirect round-trip incl. TOTP)
  used_at        DATETIME NULL,                       -- stamped at exchange
  CONSTRAINT fk_mas_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  INDEX idx_mas_expires (expires_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS mobile_auth_codes (
  id          INT AUTO_INCREMENT PRIMARY KEY,
  code_hash   CHAR(64)     NOT NULL UNIQUE,           -- sha256 hex of the opaque >=128-bit code
  user_id     INT          NOT NULL,
  session_id  CHAR(36)     NOT NULL,                  -- owning mobile_auth_sessions.session_id (ties code→PKCE challenge)
  created_at  DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  expires_at  DATETIME NOT NULL,                      -- very short (~5 min)
  used_at     DATETIME NULL,                          -- set on first successful exchange (single use)
  CONSTRAINT fk_mac_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  INDEX idx_mac_expires (expires_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Denylist of revoked web/cookie session tokens, keyed on the JWT `jti` minted
-- per session in createSession. A single logout adds this session's jti here;
-- requireAuth rejects any token whose jti is present. Rows self-expire: expires_at
-- mirrors the token's own exp, after which the JWT fails verification anyway, so
-- the row is dead weight and gets pruned. "Log out everywhere" / password change
-- do NOT use this table — they bump users.tokens_valid_after instead (one row vs.
-- one-per-session). This is the web/cookie analogue of mobile_refresh_tokens.
CREATE TABLE IF NOT EXISTS revoked_sessions (
  jti        CHAR(36) PRIMARY KEY,           -- the session's JWT jti (uuid v4)
  user_id    INT NULL,
  expires_at DATETIME NOT NULL,              -- mirrors the token exp (prune after)
  revoked_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT fk_revoked_sessions_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  INDEX idx_revoked_sessions_expires (expires_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Trusted devices for MFA (opt-in "Trust this device"). A trusted device lets a
-- browser/app SKIP the TOTP step at login — never the password. Pattern-identical
-- to mobile_refresh_tokens: the opaque trust token lives client-side (the rg_trust
-- cookie on web, EncryptedSharedPreferences on mobile) and only its sha256 hash is
-- stored here (token_hash UNIQUE, so the login path can look a device up in O(1)).
-- sha256 (not bcrypt) because the token is a 256-bit random value looked up BY its
-- hash — a per-row salt would break the index lookup. Trust is consulted only at
-- the login/password step, never at token refresh, and is revoked on untrust /
-- password change/reset / TOTP disable. Capped at 10 rows per user (enforced in
-- application code — no silent pruning). See docs/website/TRUSTED_DEVICES_MFA.md.
CREATE TABLE IF NOT EXISTS trusted_devices (
  id           INT AUTO_INCREMENT PRIMARY KEY,
  user_id      INT NOT NULL,
  token_hash   CHAR(64)     NOT NULL UNIQUE,          -- sha256 hex of the opaque trust token
  platform     ENUM('web','mobile') NOT NULL DEFAULT 'web',
  device_name  VARCHAR(100) NULL,                     -- friendly label for the Trusted Devices list
  device_hash  VARCHAR(32)  NULL,                     -- best-effort UA+IP (sessionMeta) — display only
  user_agent   VARCHAR(255) NULL,
  created_at   DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  last_used_at DATETIME NULL,                         -- stamped when trust is honored at login
  expires_at   DATETIME NOT NULL,                     -- created_at + 30d
  revoked_at   DATETIME NULL,
  CONSTRAINT fk_td_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  INDEX idx_td_user (user_id),
  INDEX idx_td_expires (expires_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Single-use recovery (backup) codes for MFA. Generated at TOTP enrollment (10 at a
-- time, shown to the user ONCE) so a user who loses their authenticator can complete
-- login without an admin reset. code_hash is a BCRYPT hash (not sha256): a recovery
-- code is a human-typed, lower-entropy fallback credential — the closest analogue to
-- a password — and there is no hash-lookup constraint (we fetch the user's <=10 rows
-- and bcrypt.compare each, exactly like password verification). Cleared wholesale on
-- TOTP disable / password change/reset. See docs/website/TRUSTED_DEVICES_MFA.md.
CREATE TABLE IF NOT EXISTS recovery_codes (
  id         INT AUTO_INCREMENT PRIMARY KEY,
  user_id    INT NOT NULL,
  code_hash  VARCHAR(72)  NOT NULL,                   -- bcrypt hash of one recovery code
  used_at    DATETIME NULL,                           -- single-use marker
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT fk_rc_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  INDEX idx_rc_user (user_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Discord bot control (Phase 1). Singleton row (id = 1) holding the bot's
-- config — the token is encrypted at rest (bot_token_enc) the same way OAuth
-- client secrets are, and is only ever decrypted server-side to push to the
-- bot process over the internal API; it is never returned to the admin UI
-- and the bot process never reads this table directly. `status`/`status_detail`
-- /`last_connected_at` are last-known-state mirrors of what the bot reported,
-- shown in the admin panel between polls.
CREATE TABLE IF NOT EXISTS bot_config (
  id                INT PRIMARY KEY DEFAULT 1,
  guild_id          VARCHAR(32)  NULL,
  bot_token_enc     TEXT         NULL,
  application_id    VARCHAR(32)  NULL,
  enabled           TINYINT(1)   NOT NULL DEFAULT 0,
  status            VARCHAR(20)  NOT NULL DEFAULT 'disconnected',
  status_detail     VARCHAR(500) NULL,
  last_connected_at DATETIME     NULL,
  updated_by        INT          NULL,
  created_at        DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at        DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  CONSTRAINT fk_bot_config_user FOREIGN KEY (updated_by) REFERENCES users(id) ON DELETE SET NULL,
  CONSTRAINT chk_bot_config_singleton CHECK (id = 1)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Outbound email configuration (Gmail over OAuth2 / SMTP XOAUTH2). Singleton row
-- (id = 1), mirroring bot_config: the DB only ever holds the AES-256-GCM-encrypted
-- refresh token, never plaintext, and the client id/secret are NOT stored here —
-- they are read live from the `google` auth_providers row. The refresh token is
-- captured by the in-app "Connect Gmail" consent flow and is write-only over the
-- admin API (never returned; responses expose only hasRefreshToken).
CREATE TABLE IF NOT EXISTS email_config (
  id                 INT PRIMARY KEY DEFAULT 1,
  provider           VARCHAR(20)  NOT NULL DEFAULT 'gmail_oauth2',
  enabled            TINYINT(1)   NOT NULL DEFAULT 0,
  sender_email       VARCHAR(255) NULL,        -- connected Gmail address (from userinfo)
  sender_name        VARCHAR(120) NULL,        -- optional From display name
  refresh_token_enc  TEXT         NULL,        -- AES-256-GCM ciphertext, never exposed
  status             VARCHAR(20)  NOT NULL DEFAULT 'unconfigured',
  status_detail      VARCHAR(500) NULL,
  last_verified_at   DATETIME     NULL,
  updated_by         INT          NULL,
  created_at         DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at         DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  CONSTRAINT fk_email_config_user FOREIGN KEY (updated_by) REFERENCES users(id) ON DELETE SET NULL,
  CONSTRAINT chk_email_config_singleton CHECK (id = 1)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Site-side mirror of in-game-account → website-user links. The sidecar is the
-- source of truth (it tags the game account with the websiteUserId on
-- /link/confirm); this table mirrors it so the player portal can list a user's
-- linked accounts and enforce ownership on roster/vendor reads without a shard
-- round-trip. account is unique (one game account maps to at most one site user);

-- Admin email invites (Protocol 2.0 provisioning). A staff member invites someone
-- by email at a pre-chosen access level; the invitee accepts via a tokened link,
-- which creates their website user at that role (and optionally a linked game
-- account). Only the sha256 hash of the opaque token is stored — a DB read never
-- yields a usable invite link, same as mobile_refresh_tokens. status tracks the
-- lifecycle; accepted_user_id back-points at the created user. Single-use +
-- expiring (enforced in the model on top of expires_at).
CREATE TABLE IF NOT EXISTS user_invites (
  id                INT AUTO_INCREMENT PRIMARY KEY,
  token_hash        CHAR(64)     NOT NULL UNIQUE,     -- sha256 hex of the opaque token
  email             VARCHAR(255) NOT NULL,
  role              ENUM('admin','editor','moderator','player') NOT NULL DEFAULT 'player',
  status            ENUM('pending','accepted','revoked') NOT NULL DEFAULT 'pending',
  invited_by        INT          NULL,                -- staff user who sent it
  accepted_user_id  INT          NULL,                -- the user created on accept
  expires_at        DATETIME     NOT NULL,
  created_at        DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  accepted_at       DATETIME     NULL,
  CONSTRAINT fk_user_invites_inviter FOREIGN KEY (invited_by) REFERENCES users(id) ON DELETE SET NULL,
  CONSTRAINT fk_user_invites_user FOREIGN KEY (accepted_user_id) REFERENCES users(id) ON DELETE SET NULL,
  INDEX idx_user_invites_email (email),
  INDEX idx_user_invites_status (status, expires_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Self-service password resets. A user requests a reset by email; a tokened link
-- is emailed to every active account on that address. Opening the link and setting
-- a new password rotates the hash and revokes all sessions (web + mobile). Only the
-- sha256 hash of the opaque token is stored — a DB read never yields a usable link,
-- same as user_invites / mobile_refresh_tokens. Single-use + short-lived (1h,
-- enforced in the model on top of expires_at). Also serves SSO-only accounts (null
-- password_hash) as their "set an initial password" path.
CREATE TABLE IF NOT EXISTS password_resets (
  id                INT AUTO_INCREMENT PRIMARY KEY,
  token_hash        CHAR(64)     NOT NULL UNIQUE,     -- sha256 hex of the opaque token
  user_id           INT          NOT NULL,            -- the account this reset targets
  status            ENUM('pending','used') NOT NULL DEFAULT 'pending',
  requested_ip      VARCHAR(64)  NULL,                -- who asked (audit only)
  expires_at        DATETIME     NOT NULL,
  created_at        DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  used_at           DATETIME     NULL,
  CONSTRAINT fk_password_resets_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  INDEX idx_password_resets_user (user_id),
  INDEX idx_password_resets_status (status, expires_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- ── Push notifications (opt-in) ─────────────────────────────────────────────
-- One row per registered push endpoint (Android/UnifiedPush v1; FCM later). The
-- `endpoint` is the UnifiedPush distributor URL the app's ntfy topic was handed —
-- unguessable but NOT a secret (the security model treats ntfy as an untrusted
-- relay and only ever pushes content-free tickles), so it is stored in the clear,
-- unlike mobile_refresh_tokens. A device belongs to one user; re-registering the
-- same endpoint for the same user is an idempotent upsert (UNIQUE user_id+endpoint).
CREATE TABLE IF NOT EXISTS push_devices (
  id           INT AUTO_INCREMENT PRIMARY KEY,
  user_id      INT          NOT NULL,
  transport    ENUM('unifiedpush','fcm') NOT NULL DEFAULT 'unifiedpush',
  endpoint     VARCHAR(512) NOT NULL,             -- distributor URL (or FCM token)
  platform     VARCHAR(40)  NULL,                 -- e.g. 'android' (free-form label)
  created_at   DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  last_seen_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  CONSTRAINT fk_push_devices_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  UNIQUE KEY uq_push_devices_user_endpoint (user_id, endpoint),
  INDEX idx_push_devices_user (user_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Which notification streams a user has opted into. Subscriptions are per-user
-- (applied to every device the user has registered), not per-device. stream_id is
-- an id from the notification catalog (config/notificationStreams.js), validated
-- in the model on write. One row per (user, stream); PUT replaces the whole set.
CREATE TABLE IF NOT EXISTS notification_subscriptions (
  user_id    INT          NOT NULL,
  stream_id  VARCHAR(64)  NOT NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (user_id, stream_id),
  CONSTRAINT fk_notif_subs_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
  INDEX idx_notif_subs_stream (stream_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Discord bot moderation core (Phase 2). These tables are owned by the bot
-- process (its own DB pool, bot/src/db.js) — the main server never reads or
-- writes them. They live in the same physical database as everything else
-- (per the spec's "shared instance, clearly prefixed where needed" option)
-- purely because there's no separate migration tooling to stand up a second
-- database for a single-guild v1 bot.

-- Per-guild key/value config the bot needs at runtime (currently just the
-- mod-log channel; filters/schedules/role-menu config lands here in later
-- phases). Set via the `/modlog set` slash command, not the admin panel —
-- unlike bot_config (identity/connection secrets), this is routine Discord
-- server administration staff already do inside Discord.
CREATE TABLE IF NOT EXISTS guild_config (
  guild_id   VARCHAR(32)  NOT NULL,
  `key`      VARCHAR(64)  NOT NULL,
  value      VARCHAR(500) NULL,
  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (guild_id, `key`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Audit trail + mod-log source of truth for ban/kick/mute/warn actions.
-- duration_seconds is only set for timed mutes; NULL for permanent
-- ban/kick/warn actions.
CREATE TABLE IF NOT EXISTS mod_actions (
  id               INT AUTO_INCREMENT PRIMARY KEY,
  guild_id         VARCHAR(32)  NOT NULL,
  action_type      ENUM('ban','kick','mute','warn') NOT NULL,
  target_user_id   VARCHAR(32)  NOT NULL,
  target_tag       VARCHAR(120) NULL,
  staff_user_id    VARCHAR(32)  NOT NULL,
  staff_tag        VARCHAR(120) NULL,
  reason           VARCHAR(500) NULL,
  duration_seconds INT NULL,
  created_at       DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  INDEX idx_mod_actions_target (guild_id, target_user_id, created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Player-submitted moderation appeals (Phase 6c). Unlike mod_actions above, this
-- table is SERVER-owned — written and read only by the main site (the player
-- appeals controller and the admin moderation queue), never by the bot. A player
-- appeals one of their own ban/mute mod_actions; staff triage the queue, and an
-- approval optionally triggers an automatic Discord reversal (Phase 6d) whose
-- outcome is recorded in reversal_status. mod_action_id is a plain column with NO
-- hard FK to the bot-owned mod_actions table (cross-owner FK avoided on purpose,
-- matching posts.announce_job_id) — existence is validated in app code. user_id
-- is the appealing site account; discord_user_id is the snowflake the appeal is
-- for (snapshotted from mod_actions.target_user_id at submit time).
CREATE TABLE IF NOT EXISTS appeals (
  id                 INT AUTO_INCREMENT PRIMARY KEY,
  mod_action_id      INT NOT NULL,
  discord_user_id    VARCHAR(32)  NOT NULL,
  action_type        ENUM('ban','mute') NOT NULL,
  user_id            INT NULL,
  status             ENUM('pending','under_review','approved','denied','withdrawn') NOT NULL DEFAULT 'pending',
  submitted_text     TEXT NOT NULL,
  staff_response     TEXT NULL,
  handled_by_user_id INT NULL,
  handled_by_tag     VARCHAR(120) NULL,
  reversal_status    ENUM('none','done','failed') NOT NULL DEFAULT 'none',
  submitted_at       DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  resolved_at        DATETIME NULL,
  CONSTRAINT fk_appeal_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL,
  INDEX idx_appeals_status (status, submitted_at),
  INDEX idx_appeals_action (mod_action_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Standing warnings, separate from mod_actions so /warnings can list active
-- warnings per user. expires_at is unused in Phase 2 (no decay/escalation
-- yet — deferred, see mute/warn command comments) but the column is cheap to
-- add now rather than migrate in later.
CREATE TABLE IF NOT EXISTS warnings (
  id             INT AUTO_INCREMENT PRIMARY KEY,
  guild_id       VARCHAR(32)  NOT NULL,
  target_user_id VARCHAR(32)  NOT NULL,
  target_tag     VARCHAR(120) NULL,
  staff_user_id  VARCHAR(32)  NOT NULL,
  staff_tag      VARCHAR(120) NULL,
  reason         VARCHAR(500) NULL,
  created_at     DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  expires_at     DATETIME NULL,
  INDEX idx_warnings_target (guild_id, target_user_id, created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Banned-word list (Phase 3). `word` is stored as the admin typed it; matching
-- normalizes both sides at runtime (case, leetspeak, repeated chars — see
-- bot/src/filter/normalize.js), so the stored value doesn't need every
-- obfuscated variant. severity drives the auto-action: delete-only, delete +
-- warn, or delete + mute (see messageFilter.js). The role/channel allowlist
-- that bypasses filtering entirely lives in guild_config (keys
-- filter_allow_roles / filter_allow_channels, CSV of snowflake ids) rather
-- than a separate table — it's a short, rarely-changed list.
CREATE TABLE IF NOT EXISTS filter_words (
  id            INT AUTO_INCREMENT PRIMARY KEY,
  guild_id      VARCHAR(32)  NOT NULL,
  word          VARCHAR(200) NOT NULL,
  severity      ENUM('delete','warn','mute') NOT NULL DEFAULT 'delete',
  added_by      VARCHAR(32)  NULL,
  added_by_tag  VARCHAR(120) NULL,
  created_at    DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  UNIQUE KEY uq_filter_words_guild_word (guild_id, word)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Scheduled/recurring messages (Phase 4). A row is EITHER recurring
-- (cron_expression set, run_at NULL — reposts on the node-cron schedule
-- forever until disabled/removed) OR one-off (run_at set, cron_expression
-- NULL — posted once, then sent_at is stamped so the scheduler's due-message
-- sweep never reposts it). content is plain text for now — the original spec
-- allows richer embed JSON here, deferred since authoring embed JSON through a
-- single slash-command string option isn't practical without a modal/admin UI.
CREATE TABLE IF NOT EXISTS scheduled_messages (
  id              INT AUTO_INCREMENT PRIMARY KEY,
  guild_id        VARCHAR(32)  NOT NULL,
  channel_id      VARCHAR(32)  NOT NULL,
  content         VARCHAR(2000) NOT NULL,
  cron_expression VARCHAR(100) NULL,
  run_at          DATETIME NULL,
  enabled         TINYINT(1) NOT NULL DEFAULT 1,
  sent_at         DATETIME NULL,
  created_by      VARCHAR(32)  NULL,
  created_by_tag  VARCHAR(120) NULL,
  created_at      DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT chk_schedule_kind CHECK (
    (cron_expression IS NOT NULL AND run_at IS NULL) OR
    (cron_expression IS NULL AND run_at IS NOT NULL)
  ),
  INDEX idx_scheduled_due (run_at, sent_at, enabled)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Self-assignable role menus (Phase 5). Button-based, not reaction-based —
-- avoids needing the messageReactionAdd/Remove events and their own intent.
-- `mapping` is a JSON array of {roleId, label}, validated against at click
-- time (see bot/src/discord/roleMenuHandler.js) so a stale/foreign button
-- customId can't toggle an untracked role. Auto-role-on-join is simpler and
-- reuses guild_config (key auto_role_id) rather than a table of its own.
CREATE TABLE IF NOT EXISTS role_menus (
  id         INT AUTO_INCREMENT PRIMARY KEY,
  guild_id   VARCHAR(32) NOT NULL,
  channel_id VARCHAR(32) NOT NULL,
  message_id VARCHAR(32) NOT NULL,
  mapping    TEXT NOT NULL,
  created_by VARCHAR(32) NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  UNIQUE KEY uq_role_menus_message (message_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Timed role assignments (temp-mute-equivalent roles, timed event roles).
-- Swept once a minute (bot/src/roles/tempRoleSweeper.js) — expired rows have
-- their Discord role removed and the row deleted. UNIQUE(guild,user,role) so
-- re-granting the same temp role just refreshes its expiry via ON DUPLICATE
-- KEY UPDATE rather than stacking duplicate rows.
CREATE TABLE IF NOT EXISTS temp_roles (
  id         INT AUTO_INCREMENT PRIMARY KEY,
  guild_id   VARCHAR(32) NOT NULL,
  user_id    VARCHAR(32) NOT NULL,
  role_id    VARCHAR(32) NOT NULL,
  expires_at DATETIME NOT NULL,
  created_by VARCHAR(32) NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  UNIQUE KEY uq_temp_roles_user_role (guild_id, user_id, role_id),
  INDEX idx_temp_roles_expires (expires_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Audit trail for the auto-rotating primary invite (Phase 6). triggered_by
-- NULL means the weekly scheduled rotation did it, not a staff member — see
-- bot/src/invites/inviteRotator.js, shared by both /invite rotate and the
-- cron job so both paths log identically. The channel invites are created in
-- is configured separately in guild_config (key invite_channel_id).
CREATE TABLE IF NOT EXISTS invite_log (
  id               INT AUTO_INCREMENT PRIMARY KEY,
  guild_id         VARCHAR(32)  NOT NULL,
  channel_id       VARCHAR(32)  NOT NULL,
  invite_code      VARCHAR(20)  NOT NULL,
  triggered_by     VARCHAR(32)  NULL,
  triggered_by_tag VARCHAR(120) NULL,
  created_at       DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  revoked_at       DATETIME NULL,
  INDEX idx_invite_log_guild (guild_id, created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Guild member join/leave events (Phase 6b). Powers the dashboard's joins/leaves
-- feeds and the invite-usage view. Bot-owned (written by bot/src/discord/
-- guildMemberAdd.js + guildMemberRemove.js). For joins, invite_code/inviter_*
-- record which invite was used when the bot could attribute it (best-effort, see
-- bot/src/discord/inviteTracker.js) — NULL when undeterminable or for leaves.
-- These are member lifecycle events, not moderation actions, hence separate from
-- mod_actions.
CREATE TABLE IF NOT EXISTS member_events (
  id              INT AUTO_INCREMENT PRIMARY KEY,
  guild_id        VARCHAR(32)  NOT NULL,
  event_type      ENUM('join','leave') NOT NULL,
  discord_user_id VARCHAR(32)  NOT NULL,
  username        VARCHAR(120) NULL,
  invite_code     VARCHAR(20)  NULL,
  inviter_id      VARCHAR(32)  NULL,
  inviter_tag     VARCHAR(120) NULL,
  created_at      DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  INDEX idx_member_events_guild (guild_id, created_at),
  INDEX idx_member_events_user (guild_id, discord_user_id, created_at),
  INDEX idx_member_events_invite (guild_id, invite_code)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Automated content-filter hits (Phase 6b): one row per message the word filter
-- or the foreign-invite filter deleted. Separate from mod_actions (which still
-- records the resulting warn/mute) so the dashboard can show filter volume in
-- its own right. `matched` holds the offending word (word hits) or the blocked
-- invite code (invite hits); `action_taken` is what the pipeline did. Bot-owned
-- (bot/src/discord/messageFilter.js).
CREATE TABLE IF NOT EXISTS filter_hits (
  id              INT AUTO_INCREMENT PRIMARY KEY,
  guild_id        VARCHAR(32)  NOT NULL,
  hit_type        ENUM('word','invite') NOT NULL,
  discord_user_id VARCHAR(32)  NOT NULL,
  username        VARCHAR(120) NULL,
  channel_id      VARCHAR(32)  NULL,
  matched         VARCHAR(200) NULL,
  action_taken    ENUM('delete','warn','mute') NOT NULL,
  created_at      DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  INDEX idx_filter_hits_guild (guild_id, created_at),
  INDEX idx_filter_hits_user (guild_id, discord_user_id, created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Automated spam-detection hits (Phase 6b): rate-limit / mass-mention /
-- mass-emoji triggers. As with filter_hits, mod_actions still logs the resulting
-- warn; this records the detection itself for the dashboard's spam feed.
-- Bot-owned (bot/src/discord/messageFilter.js via bot/src/filter/spamFilter.js).
CREATE TABLE IF NOT EXISTS spam_hits (
  id              INT AUTO_INCREMENT PRIMARY KEY,
  guild_id        VARCHAR(32)  NOT NULL,
  spam_type       ENUM('rate_limit','mass_mention','mass_emoji') NOT NULL,
  discord_user_id VARCHAR(32)  NOT NULL,
  username        VARCHAR(120) NULL,
  channel_id      VARCHAR(32)  NULL,
  created_at      DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  INDEX idx_spam_hits_guild (guild_id, created_at),
  INDEX idx_spam_hits_user (guild_id, discord_user_id, created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Staff notes on a Discord user, surfaced in the admin moderation dashboard
-- (Phase 6). Unlike the tables above, this one is SERVER-owned — it is written
-- and read only by the main site (moderation.controller), never by the bot.
-- Keyed by discord_user_id (a snowflake, matching mod_actions.target_user_id) so
-- notes attach to a Discord identity even when it has no linked site account.
-- Notes are never user-visible; admin_only notes are further restricted to the
-- admin role (moderators see staff_only only) — enforced in the query layer.
CREATE TABLE IF NOT EXISTS mod_notes (
  id              INT AUTO_INCREMENT PRIMARY KEY,
  discord_user_id VARCHAR(32)  NOT NULL,
  author_user_id  INT          NULL,
  author_tag      VARCHAR(120) NULL,
  body            TEXT         NOT NULL,
  visibility      ENUM('staff_only','admin_only') NOT NULL DEFAULT 'staff_only',
  created_at      DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT fk_mod_notes_author FOREIGN KEY (author_user_id) REFERENCES users(id) ON DELETE SET NULL,
  INDEX idx_mod_notes_user (discord_user_id, created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Generic CMS pages composed from a fixed palette of blocks (the page builder).
-- `blocks` is a JSON array of block-envelope objects ({ id, type, version,
-- visible, props }); it is stored as text and parsed/validated in app code
-- against the block registry (server/src/blocks) on every save — the same
-- pattern role_menus.mapping uses, since MariaDB's JSON type is just LONGTEXT and
-- the driver hands it back as a string anyway. The seo_*/og_image/canonical_url/
-- robots and layout/nav_* columns are metadata/settings surfaced grouped in the
-- API response; several have no consumer yet but are cheap to add now and painful
-- to retrofit once real pages exist. published_at mirrors posts: stamped the first
-- time a page goes to 'published'.
CREATE TABLE IF NOT EXISTS pages (
  id               INT AUTO_INCREMENT PRIMARY KEY,
  slug             VARCHAR(160) NOT NULL UNIQUE,
  title            VARCHAR(200) NOT NULL,
  blocks           MEDIUMTEXT   NOT NULL,      -- JSON array of block objects
  status           ENUM('draft','published') NOT NULL DEFAULT 'draft',
  protected        TINYINT(1)   NOT NULL DEFAULT 0,
  author_id        INT          NULL,
  -- SEO / social metadata (grouped under `metadata` in the API response).
  seo_title        VARCHAR(200) NULL,
  meta_description VARCHAR(400) NULL,
  og_image         VARCHAR(500) NULL,
  canonical_url    VARCHAR(500) NULL,
  robots           VARCHAR(100) NULL,
  -- Presentation / navigation (grouped under `settings` in the API response).
  layout           ENUM('default','full_width','landing') NOT NULL DEFAULT 'default',
  show_in_nav      TINYINT(1)   NOT NULL DEFAULT 0,
  nav_group        ENUM('main','footer','account','hidden') NULL,
  nav_order        INT          NULL,
  created_at       DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at       DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  published_at     DATETIME NULL,
  CONSTRAINT fk_pages_author FOREIGN KEY (author_id) REFERENCES users(id) ON DELETE SET NULL,
  INDEX idx_pages_status (status),
  INDEX idx_pages_nav (show_in_nav, nav_group, nav_order)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Announcement pipeline. One row per publish event of a news post; the table
-- doubles as the job queue (a light in-process poller — utils/announceWorker.js
-- — sweeps it for due legs). `status` is a derived rollup of the legs (see
-- announceJobs.logic.js): done when every leg is done, failed when every leg is
-- exhausted, partial in between. post_id is INT (matches posts.id) and cascades
-- so deleting a post reaps its jobs. posts.announce_job_id points back at the
-- latest row for admin lookups.
CREATE TABLE IF NOT EXISTS announce_jobs (
  id                        INT AUTO_INCREMENT PRIMARY KEY,
  post_id                   INT NOT NULL,
  status                    ENUM('pending','partial','done','failed') NOT NULL DEFAULT 'pending',
  created_at                DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at                DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  CONSTRAINT fk_announce_jobs_post FOREIGN KEY (post_id) REFERENCES posts(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- One row per delivery leg per job. INDEPENDENT by design: a Discord outage never
-- blocks or retries another leg, and each leg tracks its own attempt count, last
-- error and next-due time for exponential backoff.
--
-- This is a child table rather than a pair of leg-prefixed column groups on
-- announce_jobs because the leg set is DATA now, not schema: core registers
-- `discord`, module-uo registers `towncrier`, and a module for another game
-- registers its own — through modules/registries.js's registerAnnounceLeg
-- (MODULE_SYSTEM.md §1.8). A module cannot ALTER a core table, so a leg that
-- needed its own columns could never come from a module at all. `leg` is a plain
-- VARCHAR and not an ENUM for the same reason.
CREATE TABLE IF NOT EXISTS announce_job_legs (
  job_id                    INT NOT NULL,
  leg                       VARCHAR(64) NOT NULL,
  status                    ENUM('pending','done','failed') NOT NULL DEFAULT 'pending',
  attempts                  SMALLINT NOT NULL DEFAULT 0,
  last_error                TEXT NULL,
  next_attempt_at           DATETIME NULL,
  created_at                DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at                DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (job_id, leg),
  CONSTRAINT fk_announce_job_legs_job FOREIGN KEY (job_id) REFERENCES announce_jobs(id) ON DELETE CASCADE,
  INDEX idx_announce_leg_due (status, next_attempt_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Carry the two hardcoded leg column groups over to the child table, once. Guarded
-- on the OLD columns still existing (via information_schema, since a plain SELECT
-- of a dropped column is a parse error, not a runtime one) and on there being no
-- row already, so replaying this file on every boot is a no-op after the first.
-- Deleting this block once every deployment has booted it is safe.
SET @has_legacy_legs := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
   WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'announce_jobs'
     AND COLUMN_NAME = 'towncrier_status'
);
SET @sql := IF(@has_legacy_legs > 0,
  'INSERT IGNORE INTO announce_job_legs (job_id, leg, status, attempts, last_error, next_attempt_at)
     SELECT id, ''towncrier'', towncrier_status, towncrier_attempts, towncrier_last_error, towncrier_next_attempt_at FROM announce_jobs
     UNION ALL
     SELECT id, ''discord'', discord_status, discord_attempts, discord_last_error, discord_next_attempt_at FROM announce_jobs',
  'DO 0');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- MariaDB's IF EXISTS makes this idempotent, so it replays cleanly like the rest
-- of the file. It is the one DROP in core's schema, and it is deliberate: leaving
-- the columns would leave `towncrier` in a core file, which Phase 3's acceptance
-- grep forbids (MODULE_SYSTEM.md §2.7).
ALTER TABLE announce_jobs
  DROP COLUMN IF EXISTS towncrier_status,
  DROP COLUMN IF EXISTS towncrier_attempts,
  DROP COLUMN IF EXISTS towncrier_last_error,
  DROP COLUMN IF EXISTS towncrier_next_attempt_at,
  DROP COLUMN IF EXISTS discord_status,
  DROP COLUMN IF EXISTS discord_attempts,
  DROP COLUMN IF EXISTS discord_last_error,
  DROP COLUMN IF EXISTS discord_next_attempt_at,
  DROP INDEX IF EXISTS idx_announce_due,
  DROP INDEX IF EXISTS idx_announce_due_discord;

-- Installed modules (module system, docs/website/MODULE_SYSTEM.md §2.4). One row
-- per module the operator has installed onto the modules volume, keyed by the
-- module id from its module.json — the same id that names the directory, the URL
-- segment and the client registry key.
--
-- This table is a RECORD of what happened, never the source of truth for what is
-- mounted: the loader scans the filesystem at require time, before the database is
-- reachable (MODULE_API.md §4.1), so the URL surface is a property of the volume
-- and not of a row here. What the row decides is whether a mounted module answers
-- (`disabled` ⇒ its guard 404s, §4.5) and what the admin panel shows after a
-- failure.
--
-- `state` is the §2.4 machine in one column: installed → enabled → started, with
-- disabled and startup_failed as the recoverable states. `installed` is the
-- transient state between an install writing the row and the restart that starts
-- it. On every boot each non-disabled row is reset to `enabled` and re-attempted
-- (so a fixed module recovers on restart, with no panel visit needed), then the
-- load outcome writes `started` or `startup_failed`. Only `disabled` survives a
-- boot untouched — it is the operator's decision, not an outcome.
--
-- failure_stage/failure_reason are §4.4's recorded reason, one of the seven
-- validation steps of §4.3 plus `boot`. Both are cleared by every transition that
-- is not a failure, so a stale reason can never be shown against a running module.
--
-- source/sha256 are install provenance (§2.5): the release the bundle came from and
-- the digest that was verified before unpacking. Both NULL for a directory placed
-- on the volume by hand, which stays supported.
CREATE TABLE IF NOT EXISTS installed_modules (
  id             VARCHAR(32)  NOT NULL PRIMARY KEY,   -- module.json id; names the directory
  name           VARCHAR(128) NOT NULL,               -- human label for the admin Modules screen
  version        VARCHAR(32)  NOT NULL,               -- module.json version (semver)
  state          ENUM('installed','enabled','disabled','started','startup_failed')
                 NOT NULL DEFAULT 'installed',
  failure_stage  VARCHAR(32)  NULL,                   -- manifest|core_api|mounts|extensions|schema|require|register|boot
  failure_reason TEXT         NULL,                   -- the recorded reason, shown in the admin panel
  source         VARCHAR(255) NULL,                   -- release URL the bundle came from
  sha256         CHAR(64)     NULL,                   -- verified bundle digest
  installed_at   DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  started_at     DATETIME     NULL,                   -- last successful start
  updated_at     DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  INDEX idx_installed_modules_state (state)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Migrations for databases created before the wiki upgrade. Each statement uses
-- IF NOT EXISTS so re-running on every boot is a harmless no-op. New installs get
-- these columns from the CREATE TABLE above; existing installs get them here.
-- (The category foreign key is only added on fresh installs; on upgraded databases
-- referential integrity for category_id is enforced in application code.)
-- Opt-in TOTP two-factor columns for databases created before login hardening.
ALTER TABLE users ADD COLUMN IF NOT EXISTS totp_secret VARCHAR(64) NULL;
ALTER TABLE users ADD COLUMN IF NOT EXISTS totp_enabled TINYINT(1) NOT NULL DEFAULT 0;
-- Session-revocation cutoff for databases created before token revocation landed.
ALTER TABLE users ADD COLUMN IF NOT EXISTS tokens_valid_after DATETIME NULL;
-- Moderation dashboard (Phase 6): add the 'moderator' role to databases created
-- before it. MODIFY has no IF NOT EXISTS form, but re-declaring the same ENUM is
-- an idempotent no-op, so it is safe to run on every boot.
-- Player accounts: widen the enum again to include 'player' (self-service public
-- accounts). Same idempotent-MODIFY pattern.
ALTER TABLE users MODIFY COLUMN role ENUM('admin','editor','moderator','player') NOT NULL DEFAULT 'admin';
-- Player accounts: make password_hash nullable (SSO-only players), pin the
-- username collation (case-insensitive uniqueness backstop), and add the player
-- columns to databases created before this. MODIFY is an idempotent no-op when
-- the column already matches; ADD COLUMN IF NOT EXISTS is safe to re-run.
ALTER TABLE users MODIFY COLUMN password_hash VARCHAR(72) NULL;
ALTER TABLE users MODIFY COLUMN username VARCHAR(32) NOT NULL COLLATE utf8mb4_general_ci;
ALTER TABLE users ADD COLUMN IF NOT EXISTS email VARCHAR(255) NULL;
ALTER TABLE users ADD COLUMN IF NOT EXISTS email_verified TINYINT(1) NOT NULL DEFAULT 0;
ALTER TABLE users ADD COLUMN IF NOT EXISTS status ENUM('active','pending','disabled','banned') NOT NULL DEFAULT 'active';
ALTER TABLE users ADD COLUMN IF NOT EXISTS last_login_ip VARCHAR(45) NULL;
-- Player self-registration mode: disabled | password | sso | both. Default off,
-- so the system behaves exactly as today until an admin opts in.
INSERT IGNORE INTO settings (`key`, value) VALUES ('player_registration', 'disabled');

ALTER TABLE wiki_pages ADD COLUMN IF NOT EXISTS excerpt VARCHAR(400) NULL;
ALTER TABLE wiki_pages ADD COLUMN IF NOT EXISTS category_id INT NULL;
ALTER TABLE wiki_pages ADD COLUMN IF NOT EXISTS published TINYINT(1) NOT NULL DEFAULT 1;
ALTER TABLE wiki_pages ADD COLUMN IF NOT EXISTS sort_order INT NOT NULL DEFAULT 0;
ALTER TABLE wiki_pages ADD COLUMN IF NOT EXISTS published_at DATETIME NULL;
ALTER TABLE wiki_pages ADD FULLTEXT INDEX IF NOT EXISTS idx_wiki_search (title, body);

-- News → town-crier + Discord announcement pipeline. Add the announcement-state
-- columns to posts on databases created before the pipeline landed. announced_at
-- is stamped once both legs deliver; announce_job_id points at the announce_jobs
-- row for the post's admin status panel. Kept as a plain column (not a hard FK)
-- so the idempotent boot migration never trips over a re-added constraint — the
-- pointer is resolved in application code and the CASCADE on announce_jobs.post_id
-- already keeps the two tables consistent.
ALTER TABLE posts ADD COLUMN IF NOT EXISTS announced_at DATETIME NULL;
ALTER TABLE posts ADD COLUMN IF NOT EXISTS announce_job_id INT NULL;

-- Mobile device sessions (M9): a friendly label the app may send at login, and
-- the last time this session token was issued/used, for the "Active Devices"
-- self-service list. Both nullable and additive; existing rows get them here.
ALTER TABLE mobile_refresh_tokens ADD COLUMN IF NOT EXISTS device_name VARCHAR(100) NULL;
ALTER TABLE mobile_refresh_tokens ADD COLUMN IF NOT EXISTS last_used_at DATETIME NULL;

-- SSO trusted devices: records that the user ticked "trust this device" on the
-- Custom Tab TOTP form, so /auth/mobile/sso/exchange knows to mint the app's own
-- trust token. A boolean only — the token is returned over that app→server call
-- and never persisted here (only its sha256 lands in trusted_devices).
ALTER TABLE mobile_auth_sessions ADD COLUMN IF NOT EXISTS trust_device TINYINT(1) NOT NULL DEFAULT 0;
