refactor: Fix bugprone-string-constructor warning

[maflcko]

String literals in C++ have a trailing null character, so the current code is fine to rely on that implicitly. However,

• the sqlite documentation explicitly mentions the null character
• code readers may wonder if the code is intentional
• clang-tidy warns about the code via bugprone-string-constructor

Address the points by putting the null character into the code and enable the clang-tidy bugprone-string-constructor check.

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