CREATE TABLE IF NOT EXISTS sha256 (
       id        integer PRIMARY KEY AUTOINCREMENT,
       url       text    UNIQUE,
       hash      text    NOT NULL,
       created   real    DEFAULT (julianday('now'))
);

CREATE TABLE IF NOT EXISTS system (
       id        integer PRIMARY KEY AUTOINCREMENT,
       name      text NOT NULL,
       version   text NOT NULL,
       asd       text NOT NULL,
       created   real    DEFAULT (julianday('now')),
       UNIQUE(name, version)
);

CREATE TABLE IF NOT EXISTS dep (
       system_id integer NOT NULL REFERENCES system(id),
       dep_id    integer NOT NULL REFERENCES system(id),
       PRIMARY KEY (system_id, dep_id)
);

CREATE TABLE IF NOT EXISTS src (
       sha256_id integer REFERENCES sha256(id),
       system_id integer UNIQUE REFERENCES system(id)
);

DROP VIEW IF EXISTS system_view;
CREATE VIEW IF NOT EXISTS system_view AS
  SELECT
    sys.name,
    sys.version,
    sys.asd,
    sha.url,
    sha.hash,
    group_concat((SELECT name FROM system WHERE id = dep.dep_id)) as deps
  FROM system sys
  JOIN src ON src.system_id = sys.id
  JOIN sha256 sha ON sha.id = src.sha256_id
  LEFT JOIN dep ON dep.system_id = sys.id
  GROUP BY sys.name;