archives: use separate table

Cleaner to separate things from the backups table.

* icon, appConfig, appStoreIcon etc are only valid for archives
* older version cloudron does not have appConfig in backups table (so it
  cannot be an archive entry)

migrations/schema.sql

@@ -156,14 +156,21 @@ CREATE TABLE IF NOT EXISTS backups(
     manifestJson TEXT, /* to validate if the app can be installed in this version of box */
     format VARCHAR(16) DEFAULT "tgz",
     preserveSecs INTEGER DEFAULT 0,
-    archive BOOLEAN DEFAULT 0,
-    appStoreIcon MEDIUMBLOB, /* only valid with archive */
-    icon MEDIUMBLOB,         /* only valid with archive */
-    appConfigJson TEXT,      /* only valid with archive */
 
     INDEX creationTime_index (creationTime),
     PRIMARY KEY (id));
 
+CREATE TABLE IF NOT EXISTS archives(
+    id VARCHAR(128) NOT NULL UNIQUE,
+    backupId VARCHAR(128) NOT NULL,
+    creationTime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    appStoreIcon MEDIUMBLOB,
+    icon MEDIUMBLOB,
+    appConfigJson TEXT,
+
+    FOREIGN KEY(backupId) REFERENCES backups(id),
+    PRIMARY KEY (id));
+
 CREATE TABLE IF NOT EXISTS eventlog(
     id VARCHAR(128) NOT NULL,
     action VARCHAR(128) NOT NULL,