CREATE TABLE files (
    id          INTEGER PRIMARY KEY,
    path        TEXT    NOT NULL UNIQUE,
    language    TEXT    NOT NULL,
    package     TEXT,
    hash        TEXT    NOT NULL,
    indexed_at  DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE symbols (
    id          INTEGER PRIMARY KEY,
    file_id     INTEGER NOT NULL REFERENCES files(id) ON DELETE CASCADE,
    name        TEXT    NOT NULL,
    kind        TEXT    NOT NULL CHECK(kind IN (
        'function', 'method', 'class', 'type',
        'interface', 'constant', 'variable', 'constructor'
    )),
    line        INTEGER NOT NULL,
    line_end    INTEGER,
    col         INTEGER,
    col_end     INTEGER,
    exported    BOOLEAN,
    parent_id   INTEGER REFERENCES symbols(id),
    UNIQUE(file_id, name, kind, line)
);

CREATE INDEX idx_symbols_name ON symbols(name);
CREATE INDEX idx_symbols_kind ON symbols(kind);
CREATE INDEX idx_symbols_file_line ON symbols(file_id, line);
CREATE INDEX idx_symbols_parent ON symbols(parent_id);
CREATE INDEX idx_symbols_exported ON symbols(exported, kind);
CREATE INDEX idx_files_path ON files(path);
CREATE INDEX idx_files_language ON files(language);
CREATE INDEX idx_files_package ON files(package);