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ABU K

class product_info(osv.osv):
    
    _name='product.info'
    
    
    _columns={
           'id':fields.integer('ID'),
            'product_id':fields.many2one('product.product','Name',required=True),
         'prod_category':fields.many2one('product.category','category'),
            'valid_from':fields.date('Valid From'),
            'valid_to':fields.date('Valid to'),
            
              }
    
    _sql_constraints=[('unique_product_id','unique(product_id)','Error! Product Name Already Exist!')]

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Nhomar Hernandez
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Can you share the log of your server, frequently there is a warning if the data base already exist that inform you yo must create the sql constraint manually, due to some records doesn't comply the constriant.

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Ray Carnes

Yes, I would check this also. SQL constraints only work if ALL of the existing data in PostgreSQL satisfy the constraint. if you install your module and any data DOES NOT satisfy the constraint, it will fail.

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Krupesh Laiya
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You can teke reference from the sales_team module for the same

    _sql_constraints = [

('code_uniq', 'unique (code)', 'The code of the sales team must be unique !')

]

or you can refer this link Constraints Help

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