-- 001_core (sqlite) — existing app schema, ported verbatim.
--
-- Tables users/walks/walk_events/sr_cards/podcast_state/feedback/
-- socratic_sessions come from agents/persistence.py `_SCHEMA`; jobs comes
-- from agents/jobs.py `_ensure_table`. Column names/types unchanged so
-- existing callers (and existing dev DBs — hence IF NOT EXISTS) keep working.
--
-- Statement separator convention: a line containing only `--;;` splits this
-- file into statements (see atp/db.py). Plain ';' inside a statement is NOT
-- a separator once the marker is used anywhere in the file.

CREATE TABLE IF NOT EXISTS users (
  user_id      TEXT PRIMARY KEY,
  display_name TEXT,
  created_at   REAL NOT NULL
);
--;;
CREATE TABLE IF NOT EXISTS walks (
  walk_id      INTEGER PRIMARY KEY AUTOINCREMENT,
  user_id      TEXT NOT NULL,
  start_node   TEXT NOT NULL,
  planned_json TEXT NOT NULL,
  completed    INTEGER NOT NULL DEFAULT 0,
  started_at   REAL NOT NULL,
  completed_at REAL
);
--;;
CREATE TABLE IF NOT EXISTS walk_events (
  event_id      INTEGER PRIMARY KEY AUTOINCREMENT,
  walk_id       INTEGER NOT NULL,
  user_id       TEXT NOT NULL,
  node          TEXT,
  step_idx      INTEGER,
  lesson_mode   TEXT,
  quiz_quality  INTEGER,
  duration_s    REAL,
  ts            REAL NOT NULL,
  FOREIGN KEY (walk_id) REFERENCES walks(walk_id)
);
--;;
CREATE INDEX IF NOT EXISTS idx_walk_events_user_node
  ON walk_events(user_id, node);
--;;
CREATE TABLE IF NOT EXISTS sr_cards (
  user_id         TEXT NOT NULL,
  node            TEXT NOT NULL,
  repetitions     INTEGER NOT NULL DEFAULT 0,
  ef              REAL    NOT NULL DEFAULT 2.5,
  interval_days   REAL    NOT NULL DEFAULT 0,
  due_ts          REAL    NOT NULL DEFAULT 0,
  last_quality    INTEGER NOT NULL DEFAULT -1,
  last_review_ts  REAL    NOT NULL DEFAULT 0,
  PRIMARY KEY (user_id, node)
);
--;;
CREATE INDEX IF NOT EXISTS idx_sr_due ON sr_cards(user_id, due_ts);
--;;
CREATE TABLE IF NOT EXISTS podcast_state (
  user_id       TEXT NOT NULL,
  episode_key   TEXT NOT NULL,
  current_turn  INTEGER NOT NULL DEFAULT 0,
  interjections TEXT,
  last_played   REAL NOT NULL,
  PRIMARY KEY (user_id, episode_key)
);
--;;
CREATE TABLE IF NOT EXISTS feedback (
  feedback_id INTEGER PRIMARY KEY AUTOINCREMENT,
  user_id     TEXT NOT NULL,
  target_kind TEXT NOT NULL,
  target_id   TEXT NOT NULL,
  thumb       INTEGER NOT NULL,
  note        TEXT,
  ts          REAL NOT NULL
);
--;;
CREATE INDEX IF NOT EXISTS idx_feedback_target
  ON feedback(target_kind, target_id);
--;;
CREATE TABLE IF NOT EXISTS socratic_sessions (
  session_id  TEXT PRIMARY KEY,
  user_id     TEXT NOT NULL,
  node        TEXT NOT NULL,
  state_json  TEXT NOT NULL,
  updated_at  REAL NOT NULL
);
--;;
CREATE TABLE IF NOT EXISTS jobs (
  job_id     TEXT PRIMARY KEY,
  kind       TEXT NOT NULL,
  status     TEXT NOT NULL,
  result     TEXT,
  error      TEXT,
  created_at REAL NOT NULL,
  updated_at REAL NOT NULL
);