Setting sql_mode for IDAs to prevent data loss

This setting ensures truncation warnings are escalated as errors. See https://docs.djangoproject.com/en/1.10/ref/databases/#mysql-sql-mode for additional info.

playbooks/roles/credentials/defaults/main.yml

@@ -27,6 +27,7 @@ CREDENTIALS_MYSQL_PASSWORD: 'SET-ME-TO-A-UNIQUE-LONG-RANDOM-STRING'
 CREDENTIALS_DATABASE_PORT: '3306'
 CREDENTIALS_MYSQL_OPTIONS:
   connect_timeout: 10
+  init_command: "SET sql_mode='STRICT_TRANS_TABLES'"
 
 CREDENTIALS_DATABASES:
   # rw user

playbooks/roles/ecommerce/defaults/main.yml

@@ -29,6 +29,7 @@ ECOMMERCE_DATABASE_HOST: "localhost"
 ECOMMERCE_DATABASE_PORT: 3306
 ECOMMERCE_MYSQL_OPTIONS:
   connect_timeout: 10
+  init_command: "SET sql_mode='STRICT_TRANS_TABLES'"
 
 ECOMMERCE_DATABASES:
   # rw user

playbooks/roles/edx_django_service/defaults/main.yml

@@ -116,6 +116,7 @@ edx_django_service_db_user: 'REPLACE-ME'
 edx_django_service_db_password: 'password'
 edx_django_service_db_options:
   connect_timeout: 10
+  init_command: "SET sql_mode='STRICT_TRANS_TABLES'"
 
 edx_django_service_databases:
   default: