Imrpove migrations

db/migrations/001_create_rodauth_tables.rb

@@ -1,19 +1,68 @@
 Sequel.migration do
   up do
+    create_table(:account_statuses) do
+      Integer :id, primary_key: true
+      String :name, null: false, unique: true
+    end
+
+    from(:account_statuses).import(
+      [:id, :name],
+      [
+        [1, "Unverified"],
+        [2, "Verified"],
+        [3, "Closed"]
+      ]
+    )
+
+    db = self
+
     create_table(:accounts) do
       primary_key :id, type: :Bignum
+
+      foreign_key :status_id, :account_statuses,
+        null: false,
+        default: 1
+
       String :email, null: false
 
-      index :email, unique: true
+      if db.supports_partial_indexes?
+        index :email, unique: true, where: { status_id: [1, 2] }
+      else
+        index :email, unique: true
+      end
     end
 
     create_table(:account_password_hashes) do
-      foreign_key :id, :accounts, primary_key: true, type: :Bignum
+      foreign_key :id, :accounts,
+        primary_key: true,
+        type: :Bignum
+
       String :password_hash, null: false
     end
+
+    create_table(:account_verification_keys) do
+      foreign_key :id, :accounts,
+        primary_key: true,
+        type: :Bignum
+
+      String :key, null: false
+
+      DateTime :requested_at,
+        null: false,
+        default: Sequel::CURRENT_TIMESTAMP
+
+      DateTime :email_last_sent,
+        null: false,
+        default: Sequel::CURRENT_TIMESTAMP
+    end
   end
 
   down do
-    drop_table(:account_password_hashes, :accounts)
+    drop_table(
+      :account_verification_keys,
+      :account_password_hashes,
+      :accounts,
+      :account_statuses
+    )
   end
 end