add volume support

part of #668, #569

migrations/schema.sql

@@ -233,4 +233,18 @@ CREATE TABLE IF NOT EXISTS appPasswords(
     PRIMARY KEY (id)
 );
 
+CREATE TABLE IF NOT EXISTS volumes(
+    id VARCHAR(128) NOT NULL UNIQUE,
+    name VARCHAR(256) NOT NULL UNIQUE,
+    hostPath VARCHAR(1024) NOT NULL UNIQUE,
+    creationTime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (id)
+);
+
+CREATE TABLE IF NOT EXISTS appVolumes(
+    appId VARCHAR(128) NOT NULL,
+    volumeId VARCHAR(128) NOT NULL,
+    FOREIGN KEY(appId) REFERENCES apps(id),
+    FOREIGN KEY(volumeId) REFERENCES volumes(id));
+
 CHARACTER SET utf8 COLLATE utf8_bin;