add script triggers.

services/mysqldb/queries/script.sql

@@ -8,4 +8,14 @@ REPLACE INTO script (name, data) VALUES (?, ?);
 SELECT * FROM script_variable;
 
 -- name: UpdateScriptVariables :exec
-REPLACE INTO script_variable (scope, name, value) VALUES (?, ?, ?);
+REPLACE INTO script_variable (scope, name, value) VALUES (?, ?, ?);
+
+-- name: ListScriptTriggers :many
+SELECT * FROM script_trigger;
+
+-- name: ReplaceScriptTrigger :exec
+REPLACE INTO script_trigger (id, event, device_match, parameter, script_target, script_name, script_pre, script_post)
+VALUES (?, ?, ?, ?, ?, ?, ?, ?);
+
+-- name: DeleteScriptTrigger :exec
+DELETE FROM script_trigger WHERE id = ?;