Messages table fixes to improve query performance (#2026)

* Move to yaml sqlc config

* Add util for ungraceful sql execs

* Fix messages schema + add indexes

* Add migration to drop+recreate messages table

* Create index only if does not exist

* Fix typo

* Unexport function

core/data/utils.go

@@ -0,0 +1,20 @@
+package data
+
+import (
+	"database/sql"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// mustExec will execute a SQL statement on a provided database instance.
+func mustExec(s string, db *sql.DB) {
+	stmt, err := db.Prepare(s)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer stmt.Close()
+	_, err = stmt.Exec()
+	if err != nil {
+		log.Warnln(err)
+	}
+}