Add a script for postgres migration

Issue: #116

scripts/migrate_postgres.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+export PGHOST=$OLD_PGHOST
+export PGPASSWORD=$OLD_PGPASSWORD
+export PGDATABASE=$OLD_PGDATABASE
+DUMP_FILE=/tmp/$PGDATABASE.dump
+pg_dump $PGDATABASE --no-owner --no-privileges -Fc -f $DUMP_FILE -vvv
+
+export PGHOST=$NEW_PGHOST
+export PGPASSWORD=$NEW_PGPASSWORD
+export PGDATABASE=$NEW_PGDATABASE
+pg_restore --no-owner --no-privileges -d $PGDATABASE -Fc $DUMP_FILE -vvv
+
+psql -c "GRANT ALL PRIVILEGES ON DATABASE \"${PGDATABASE}\" to \"${PGDATABASE}\""
+psql -c "GRANT ALL ON SCHEMA public to \"${PGDATABASE}\""
+psql -c "GRANT ALL ON ALL TABLES IN SCHEMA public TO \"${PGDATABASE}\""
+
+rm -f /tmp/output
+
+psql -c "\
+SELECT format(\
+  'ALTER TABLE %I.%I.%I OWNER TO %I;',\
+  table_catalog,\
+  table_schema,\
+  table_name,\
+  '${PGDATABASE}')\
+FROM information_schema.tables \
+WHERE table_schema='public'" | grep ALTER > /tmp/output
+
+psql -c "\
+SELECT format(\
+  'ALTER SEQUENCE %I.%I.%I OWNER TO %I;',\
+  sequence_catalog,\
+  sequence_schema,\
+  sequence_name,\
+  '${PGDATABASE}')\
+FROM information_schema.sequences \
+WHERE sequence_schema='public'" | grep ALTER >> /tmp/output
+
+psql -c "$(cat /tmp/output)"