Changes the past on the Number of outstanding reports graph after storage

[csordasmarton]

CodeChecker changes the past on the following scenario (introduce reports with same report hashes):

• Start a web server with the master branch.
• Analyze and store the following source file (it should find 2 reports -> bugprone-sizeof-expression and clang-diagnostic-unused-value):

int main() {
  sizeof(42);
}

• Open the database and change the detection date manually 2 days earlier (this way it will be easier to see the problem).
• Suppress this report with a source code comment, reanalyze the code and store it again to the same run:

int main() {
  // codechecker_suppress [bugprone-sizeof-expression] Test
  sizeof(42);
}

• Check the number of outstanding reports chart and it shows correct values:

• Change the surce code and introduce a new finding with the same hash:

int main() {
  // codechecker_suppress [bugprone-sizeof-expression] Test
  sizeof(42);

  sizeof(42);
}

• Analyze and store the results to the same run and check the chart again:

:exclamation: With this I changed the past. On the first screenshot we can see that on 5th of February I had 1 HIGH report but now I have two.