db: add script to create new migration files

db/new.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+timestamp=$(date +%Y%m%d%H%M%S)
+
+printf "rules:\n"
+printf "  * use hyphens to separate words (not spaces, not underscores)\n"
+printf "  * keep it as short as possible (add comments inside the file)\n"
+printf "  * try to keep each migration idempotent (roughly, the order of application shouldn't matter)\n"
+printf "\n"
+printf "good example: 20180416164303-init-schema.sql\n\n"
+printf "filename: %s-" "${timestamp}"
+read filename
+
+filename="${timestamp}-${filename}"
+if [[ ! $filename =~ .sql$ ]]; then
+  filename="${filename}.sql"
+fi
+
+touch "${filename}"
+echo "created ${filename}"