DB-drop-and-reset-write-down

docs/Technical-Documentation/CloudFoundry-DB-Connection.md

@@ -23,3 +23,36 @@ From [this github](https://github.com/cloud-gov/cf-service-connect) which has so
 
 > `cf connect-to-service tdp-backend-<name> tdp-db-dev`
 
+
+# How to DROP existing DB and Recreate a fresh DB
+
+### Connecting to DB service
+First step is to connect to the instance DB (see above).
+
+#### Optional: DB backup
+Before deleting the DB and recreating a fresh DB, you might want to create a backup from the existing data in case you decide to revert the DB changes back.
+
+For creating a DB backup, please see: `/tdpservice/scheduling/BACKUP_README.md`
+
+#### Drop and Recreate
+
+e.g: 
+>`cf connect-to-service tdp-backend-qasp tdp-db-dev`
+
+After connection to the DB is made (the step above will make a psql connection), then the following Postgres commands have to run:
+
+1. List the DBs: `\l`
+2. Potgres does not _DROP_ a database when you are connected to the same DB. As such, you will have to connect to a different DB using command:  
+>`\c {a_database}`
+
+   A good candiadate is:
+>`\c postgres`
+3. find the associated DB name with instance. E.g: `tdp_db_dev_qasp`
+4. use the following command to delete the DB:
+>`DROP DATABASE {DB_NAME}`
+5. use the following command to create the DB:
+>`CREATE DATABASE {DB_NAME}`
+
+After the DB is created, since the database is cinoketely empty, we will need to redeploy the app again to create tables (or alternatively we can restore a good backup), and then we should run populate stt command to add STT data to the empty DB
+
+>`./manage.py populatestts`