image text translation
user
ID “I
Name Varchar (5D)
header
ID int Uy NV
Message
FOM_ID int ly “:
ID int
UU “
TO_ID int Uy “Y
header
Int
Subject Varchar (127)
from_sender bit
status enuim (“‘)
Content text
Time TIMESTAMP
Read Bit
Time TIMESTAMP
The difference between the existing katok and the new katok
There is a writing, a ready function, a modification and modification, etc.
If you manage this for each chat log
The chat log file would have added these variables such as is -isRECTED, isRead, and isREADSECRET
The structure may have changed
Then local/server logs accumulated with new functions
Is it read in the old version
Backper error
Memory overflu
So even if you have a previous build, you don’t have to do it from the beginning
A dog -like hell unfolds
Two projects and two projects 10 years ago and 5 years ago
I managed it alone
I am still working in compatible with old versions while in -house service versions.
If you don’t design this from the beginning,