CREATE TABLE IF NOT EXISTS analytics_content_sessions (
  content_session_hash TEXT PRIMARY KEY,
  day DATE NOT NULL,
  visitor_hash TEXT NOT NULL,
  session_hash TEXT NOT NULL,
  path TEXT NOT NULL,
  post_id UUID REFERENCES posts(id) ON DELETE SET NULL,
  page_id UUID REFERENCES pages(id) ON DELETE SET NULL,
  source_group TEXT NOT NULL DEFAULT '',
  source_name TEXT NOT NULL DEFAULT '',
  device_type TEXT NOT NULL DEFAULT '',
  os_name TEXT NOT NULL DEFAULT '',
  keyword TEXT NOT NULL DEFAULT '',
  view_recorded BOOLEAN NOT NULL DEFAULT false,
  first_seen_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  last_seen_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  duration_seconds INTEGER NOT NULL DEFAULT 0,
  max_scroll_ratio REAL NOT NULL DEFAULT 0,
  engaged_recorded BOOLEAN NOT NULL DEFAULT false,
  scroll_25_recorded BOOLEAN NOT NULL DEFAULT false,
  scroll_50_recorded BOOLEAN NOT NULL DEFAULT false,
  scroll_75_recorded BOOLEAN NOT NULL DEFAULT false,
  scroll_100_recorded BOOLEAN NOT NULL DEFAULT false,
  read_recorded BOOLEAN NOT NULL DEFAULT false,
  read_at TIMESTAMPTZ
);

CREATE INDEX IF NOT EXISTS analytics_content_sessions_day_idx
  ON analytics_content_sessions (day DESC);

CREATE INDEX IF NOT EXISTS analytics_content_sessions_session_idx
  ON analytics_content_sessions (session_hash);

CREATE INDEX IF NOT EXISTS analytics_content_sessions_post_idx
  ON analytics_content_sessions (post_id, day DESC)
  WHERE post_id IS NOT NULL;

CREATE INDEX IF NOT EXISTS analytics_content_sessions_page_idx
  ON analytics_content_sessions (page_id, day DESC)
  WHERE page_id IS NOT NULL;

ALTER TABLE analytics_active_sessions
  ADD COLUMN IF NOT EXISTS content_session_hash TEXT NOT NULL DEFAULT '';