I want to insert records in batches in DB using executemany() using python. I have a below code

def find_data(db_string):
    
    json_str = '[\"{\"NAME\":\"Aman\",\"EMAIL\":\"[email protected]\",\"SALARY\":785674}\",\"{\"NAME\":\"Rahul\",\"EMAIL\":\"[email protected]\",\"SALARY\":65489}\", \"{\"NAME\":\"Vijay\",\"EMAIL\":\"[email protected]\",\"SALARY\":1254798}\"]'
    
    formatted_json = json_str.replace('\','').replace('"{','{').replace('}"','}')
    json_data = json.loads(formatted_json)  
    
    try:
        bulk_operations=[]
        
        with concurrent.futures.ThreadPoolExecutor(new_worker=10) as executor:
            
            futures_task = []
            for json_row in json_data:
                futures_task.append(executor.submit(insert_data,json_row, bulk_operations))

            concurrent.futures.wait(futures_task)
            
            
        if bulk_operations:
            insert_query = "Insert into Employee (name, email, salary, createdTs) values(?,?,?,?)"
            conn = ibm_db_dbi.connect(db_string)
            cur = conn.cursor()
            cur.executemany(insert_query, bulk_operations)
    
    expect Exception as e:
        print("Error")
            
def insert_data(json_row, bulk_operations):
    
    try:
        
        approach #1:
        name = str(json_row["NAME"])
        email = str(json_row["EMAIL"])
        salary = json_row["SALARY"]
        
        current_time = datetime.now()
        
        values = f"('{name}','{email}',{salary},'{current_time}')"
        bulk_operations.append(values)
        
        
        approach #2:
        
        name1 = json_row["NAME"]
        email1 = json_row["EMAIL"]
        salary1 = json_row["SALARY"]
        
        current_time = datetime.now()
        
        record = [(name1,email1,salary1, current_time)]
        bulk_operations.append(record)
        
        
    expect Exception as e:
        print("Error")
    

When running this I am getting below error :

[MainThread] ERROR ibm_db_dbi::DatabaseError: [IBM][CLI Driver] CLI0124E Invalid argument value. SQLSTATE=HY009 SQLCODE=-99999

Can anyone help me on this please?