CREATE TABLE history_items (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    url TEXT NOT NULL UNIQUE,
    domain_expansion TEXT NULL,
    visit_count INTEGER NOT NULL,
    daily_visit_counts BLOB NOT NULL,
    weekly_visit_counts BLOB NULL,
    autocomplete_triggers BLOB NULL,
    should_recompute_derived_visit_counts INTEGER NOT NULL,
    visit_count_score INTEGER NOT NULL);
CREATE TABLE sqlite_sequence(name, seq);
CREATE TABLE history_visits (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    history_item INTEGER NOT NULL REFERENCES history_items(id) ON DELETE CASCADE,
    visit_time REAL NOT NULL,
    title TEXT NULL,
    load_successful BOOLEAN NOT NULL DEFAULT 1,
    http_non_get BOOLEAN NOT NULL DEFAULT 0,
    synthesized BOOLEAN NOT NULL DEFAULT 0,
    redirect_source INTEGER NULL UNIQUE REFERENCES history_visits(id) ON DELETE CASCADE,
    redirect_destination INTEGER NULL UNIQUE REFERENCES history_visits(id) ON DELETE CASCADE,
    origin INTEGER NOT NULL DEFAULT 0,
    generation INTEGER NOT NULL DEFAULT 0,
    attributes INTEGER NOT NULL DEFAULT 0,
    score INTEGER NOT NULL DEFAULT 0);
CREATE TABLE history_tombstones (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    start_time REAL NOT NULL,
    end_time REAL NOT NULL,
    url TEXT,
    generation INTEGER NOT NULL DEFAULT 0);
CREATE TABLE metadata (key TEXT NOT NULL UNIQUE,
     value);
CREATE TABLE history_client_versions (client_version INTEGER PRIMARY KEY,
    last_seen REAL NOT NULL);
CREATE INDEX history_items__domain_expansion ON history_items (domain_expansion);
CREATE INDEX history_visits__last_visit ON history_visits (history_item, visit_time DESC, synthesized ASC);
CREATE INDEX history_visits__origin ON history_visits (origin, generation);
CREATE INDEX history_tombstones__generation ON history_tombstones (generation);
CREATE INDEX history_tombstones__end_time ON history_tombstones (end_time);