Search notes:

include/generated/compile.h

include/generated/compile.h is generated by scripts/mkcompile_h and defines four macros:
#define UTS_MACHINE		"x86_64"
#define LINUX_COMPILE_BY	"rene"
#define LINUX_COMPILE_HOST	"appletree"
#define LINUX_COMPILER		"gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2"
The values of these macros are used for the string linux_banner (defined and/or declared in init/version-timestamp.c and init/version.c).

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Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Linux/ke...', 1759397904, '216.73.216.42', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Linux/kernel/source/include/generated/compile_h(38): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78