PostGres Expert

I need a person that is an expert with PostGres to help up troubleshoot an issue and it help us with performance tuning of the database. Our current system we need assistance on is: CentOS Linux release 7.2.1511 (Core) psql (PostgreSQL) 9.4.9 The issue we are experiencing is: When trying to create a Foreign key Constraint from a newly created table (FOO) to a certain existing table (BAR) the process goes into waiting. We are able to successfully create foreign keys to any other table except this one, For example table FOO with a Foreign key to BUU works successfully. When trying to reindex BAR the process goes into waiting. I believe the table BAR is corrupt, although I can successfully select from the table.