millions of users -> more read than write
alphabets and number
A-Z AND a-z and 0-9 62 chars -> 62^7 3m combinations
delete yes

database schema :-1: longurl, shorturl,created_at,expiration_at,user_id

b62
md5
counters

def intersection(nums1: List[int], nums2: List[int])->List[int]
    n1= len(nums1)
    n2= len(nums2)
    nums1.sort()
    nums2.sort()
    i,j=0,0
    arr=[]
    while(i<n1 and j< n2)
        if(nums1[i]==nums2[j])
            arr.append(nums1[i])
            i++
            j++
        elif(nums1[i]<nums2[j])
            i++
        else 
            j++
    return set(arr)
            

nums1 = [1,1,2,3,3]
nums2 = [1,2,3,3]
resul = [1,2,2,3]
[1,2,]

def (nums1: List[int], nums2: List[int])->List[int]
    nums1,nums2,nums3 = set(nums1),set(nums2),set(nums3)
    return list(nums1 & nums2 & nums3)

def find_common_elements(*lists):
    """
        return_set = set(lists[0])
        for elements in lists:
            return_set &= set(elements)
            
        return list(return_set)
    """
    if not lists:
        return[]
    for lst in lists[]:
        temp_set= set()
        for item is lst
            temp_set.add(item)
    common_elements= temp_set
    return list(common_elements)

orders id , shipping address, billing address

Orders:

order_id-pk (pk)
user_id(fk)
order_date
address_id
billing_id
status


address

address_type
customer_id
billing
address_id
postal_code 
Address Line 1
state
country

orders:

1, 123, 09-10-2022, 12(shipping), 13(billing), completed
2, 123, 10-10-2022, 13(shipping), 13(billing), pending

address:

12, 1, billing, 02120, 75 st alphonsus st, MA, USA
13, 1, shipping, 02120, 75 st alphonsus st, MA, USA
14, 1, shipping, 89789, washington st, MA, USA