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The original was posted on /r/mysql by /u/AdVast6607 on 2023-08-15 11:32:48+00:00.

This is my table

CREATE TABLE IF NOT EXISTS ContractDetails ( 
    id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    ContractName VARCHAR(255) NOT NULL, 
    Time DATETIME NOT NULL, 
    FundingRate DECIMAL(10, 10) NOT NULL, 
    CurrencyID INT UNSIGNED NOT NULL, 
    ContractID INT UNSIGNED NOT NULL, 
    PRIMARY KEY (id), CONSTRAINT uc_contract_details UNIQUE (ContractName, Time, CurrencyID), 
    FOREIGN KEY (CurrencyID) REFERENCES Currency(id), 
    FOREIGN KEY (ContractID) REFERENCES Contract(id) 
);

This is the code that I am trying to run.

try:
    query = f"INSERT INTO ContractDetails (ContractName, Time, FundingRate,    CurrencyID, ContractID) VALUES ('{name}', '{time}', {funding_rate},{currency_id}, {contract_id})"
    cursor.execute(query)
except IntegrityError: 
    print('not unique')

I checked in MySql client whether there were duplicates, but it returned an empty set. Why is it happening?

SELECT * FROM ContractDetails
WHERE ContractName = 'PERP Perpetual/USDT' AND 
Time = '2023-08-15 04:00:00' AND 
FundingRate = 0.0001 AND 
CurrencyID = 1 AND 
ContractID = 116;

I have 242551 rows in the table. I am making a web scraper. It does not get stuck in a specific part. It happens randomly. Sometimes it gets this error and sometimes it doesn’t.