added update user change user and change password

src/db_delete_user.c

@@ -0,0 +1,44 @@
+#include "database.h"
+#include "sql.h"
+#include "user.h"
+
+bool db_delete_user(const int id) {
+  pthread_mutex_lock(&db_mutex);
+  if (!db) {
+    fprintf(stderr, "Database not initialized\n");
+    pthread_mutex_unlock(&db_mutex);
+    return false;
+  }
+  sqlite3_stmt *stmt;
+  int rc;
+
+  rc = sqlite3_prepare_v2(db, DELETE_USER_SQL, -1, &stmt, 0);
+  if (rc != SQLITE_OK) {
+    fprintf(stderr, "Failed to prepare statement: %s\n", sqlite3_errmsg(db));
+    pthread_mutex_unlock(&db_mutex);
+    return false;
+  }
+
+  sqlite3_bind_int(stmt, 1, id);
+
+  rc = sqlite3_step(stmt);
+  if (rc != SQLITE_DONE) {
+    fprintf(stderr, "Execution failed: %s\n", sqlite3_errmsg(db));
+    sqlite3_finalize(stmt);
+    pthread_mutex_unlock(&db_mutex);
+    return false;
+  }
+
+  int changes = sqlite3_changes(db);
+  sqlite3_finalize(stmt);
+
+  if (changes > 0) {
+    printf("User deleted successfully. ID: %d\n", id);
+  } else {
+    printf("No user found with ID: %d\n", id);
+    return false;
+  }
+
+  pthread_mutex_unlock(&db_mutex);
+  return true;
+}