As others have pointed out, it may be your schema but your code has couple of red flags in that makes me think it may be in your code:

• connecting to the database inside a loop - more than likely *not* what you want
• creating string via loop and also inserting in loop - that's going to lead to insert foo, insert foobar, insert foobarbaz, insert foobarbazqux, etc
• code formatting leaves a lot to be desired (if it's easier to read, it's easier to debug)

but maybe that's just because it's a snippet posted here for help.

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