Add instructions on connecting to Postgres

README.md

@@ -87,6 +87,38 @@ And stop the listener with
 kubectl exec deploy/mev-inspect-deployment -- /app/listener stop
 ```
 
+## Exploring
+
+All inspect output data is stored in Postgres.
+
+To connect to the local Postgres database for querying, launch a client container with:
+```
+kubectl run -i --rm --tty postgres-client --env="PGPASSWORD=password" --image=jbergknoff/postgresql-client -- mev_inspect --host=postgresql --user=postgres
+```
+
+When you see the prompt
+```
+mev_inspect=#
+```
+
+You're ready to query!
+
+Try finding the total number of swaps decoded with UniswapV3Pool
+```
+SELECT COUNT(*) FROM swaps WHERE abi_name='UniswapV3Pool';
+```
+
+or top 10 arbs by gross profit that took profit in WETH
+```
+SELECT *
+FROM arbitrages
+WHERE profit_token_address = '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2'
+ORDER BY profit_amount DESC
+LIMIT 10;
+```
+
+Postgres tip: Enter `\x` to enter "Explanded display" mode which looks nicer for results with many columns
+
 ## Contributing
 
 ### Guide
@@ -150,3 +182,13 @@ docker compose down
 ```
 
 Then go through the steps in the current README for kube setup
+
+### Error from server (AlreadyExists): pods "postgres-client" already exists
+This means the postgres client container didn't shut down correctly
+
+Delete this one with
+```
+kubectl delete pod/postgres-client
+```
+
+Then start it back up again