Work on squads, some refactoring

Closes #14
See #8

lib/migrations/22_add_flood_chat_id.go

@@ -0,0 +1,29 @@
+// i2_bot – Instinct PokememBro Bot
+// Copyright (c) 2017 Vladimir "fat0troll" Hodakov
+
+package migrations
+
+import (
+	// stdlib
+	"database/sql"
+)
+
+// AddFloodChatIDUp creates `flood_chat_id` column in `squads` table
+func AddFloodChatIDUp(tx *sql.Tx) error {
+	_, err := tx.Exec("ALTER TABLE `squads` ADD COLUMN `flood_chat_id` INT(11) NOT NULL DEFAULT 0 COMMENT 'ID группы для общения отряда' AFTER `chat_id`;")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// AddFloodChatIDDown  destroys `flood_chat_id` column
+func AddFloodChatIDDown(tx *sql.Tx) error {
+	_, err := tx.Exec("ALTER TABLE `squads` DROP COLUMN `flood_chat_id`;")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}