Covid vaccines were developed quickly: How do we know they won't cause any long-term health effects?

The Covid-19 vaccines were developed very quickly, prompting concerns about potential long-term side effects.
But history indicates that if severe side effects occur, they usually happen within the first two months after vaccination.
Vaccine technologies used in the Covid-19 vaccines have previously been used to protect against other infectious diseases, and have good safety records.
The Covid-19 vaccines were developed in record time, which is considered to be a remarkable achievement in the field of medical science. On the other hand, this has led to concerns among the public about their safety, particularly regarding potential long-term side effects. 
Nature explains, the rapid development and rollout of the vaccines were based on years of previous research on related viruses and faster ways to manufacture vaccines, as well as huge amounts of funding that allowed developers to fast-track multiple clinical studies in parallel, also with health regulators moving more quickly than usual. 

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