Postgresql conversion script.

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diff --git a/doc/update/mysql-to-postgresql.md b/doc/update/mysql-to-postgresql.md
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+# Use the shell commands below to convert a MySQL GitLab database to a PostgreSQL one.
+
+```
+git clone https://github.com/lanyrd/mysql-postgresql-converter.git
+cd mysql-postgresql-converter
+mysqldump --compatible=postgresql --default-character-set=utf8 -r databasename.mysql -u root gitlabhq_production
+python db_converter.py databasename.mysql databasename.psql
+psql -f databasename.psql -d gitlabhq_production
+```