Constant DEBUG_DDL 

pub const DEBUG_DDL: &str = "
CREATE TABLE IF NOT EXISTS commands (
    seq             INTEGER PRIMARY KEY,
    session_id      TEXT NOT NULL REFERENCES sessions(id),
    input           TEXT NOT NULL,
    output_head     TEXT,
    output_file     TEXT,
    output_bytes    INTEGER,
    ts              TEXT NOT NULL,
    canonical_op    TEXT
);
CREATE INDEX IF NOT EXISTS idx_commands_session ON commands(session_id);

CREATE TABLE IF NOT EXISTS breakpoint_hits (
    id              INTEGER PRIMARY KEY,
    session_id      TEXT NOT NULL REFERENCES sessions(id),
    location_key    TEXT NOT NULL,
    hit_seq         INTEGER NOT NULL,
    thread          TEXT,
    ts              TEXT NOT NULL,
    locals_json     TEXT,
    stack_json      TEXT
);
CREATE INDEX IF NOT EXISTS idx_bp_location ON breakpoint_hits(session_id, location_key);

CREATE TABLE IF NOT EXISTS watch_evals (
    id              INTEGER PRIMARY KEY,
    session_id      TEXT NOT NULL REFERENCES sessions(id),
    hit_id          INTEGER REFERENCES breakpoint_hits(id),
    expr            TEXT NOT NULL,
    value           TEXT,
    type_name       TEXT,
    ts              TEXT NOT NULL
);
";

Debug track tables — created for every session regardless of kind. A profile session simply never writes to them.