Add maildb

also, migrate values from settings table to maildb

migrations/schema.sql

@@ -157,3 +157,18 @@ CREATE TABLE IF NOT EXISTS domains(
 
     /* the default db collation is utf8mb4_unicode_ci but for the app table domain constraint we have to use the old one */
     CHARACTER SET utf8 COLLATE utf8_bin;
+
+CREATE TABLE IF NOT EXISTS maildb(
+    domain VARCHAR(128) NOT NULL UNIQUE,
+
+    enabled BOOLEAN DEFAULT 0, /* MDA enabled */
+    mailFromValidation BOOLEAN DEFAULT 1,
+    catchAllJson TEXT,
+    relayJson TEXT,
+
+    FOREIGN KEY(domain) REFERENCES domains(domain),
+    PRIMARY KEY(domain))
+
+    CHARACTER SET utf8 COLLATE utf8_bin;
+
+