add new functionality and improve backend server structure

- Enhance server functionality and optimize backend code
- Add multi-database support (PostgreSQL, MySQL, SQLite)

server/core_backend-server/tools/routine/routine.go

@@ -0,0 +1,32 @@
+package routine
+
+import (
+	"log"
+	"runtime/debug"
+	"sync"
+)
+
+// FireAndForget executes f() in a new go routine and auto recovers if panic.
+//
+// **Note:** Use this only if you are not interested in the result of f()
+// and don't want to block the parent go routine.
+func FireAndForget(f func(), wg ...*sync.WaitGroup) {
+	if len(wg) > 0 && wg[0] != nil {
+		wg[0].Add(1)
+	}
+
+	go func() {
+		if len(wg) > 0 && wg[0] != nil {
+			defer wg[0].Done()
+		}
+
+		defer func() {
+			if err := recover(); err != nil {
+				log.Printf("RECOVERED FROM PANIC (safe to ignore): %v", err)
+				log.Println(string(debug.Stack()))
+			}
+		}()
+
+		f()
+	}()
+}

server/core_backend-server/tools/routine/routine_test.go

@@ -0,0 +1,27 @@
+package routine_test
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/pocketbase/pocketbase/tools/routine"
+)
+
+func TestFireAndForget(t *testing.T) {
+	called := false
+
+	fn := func() {
+		called = true
+		panic("test")
+	}
+
+	wg := &sync.WaitGroup{}
+
+	routine.FireAndForget(fn, wg)
+
+	wg.Wait()
+
+	if !called {
+		t.Error("Expected fn to be called.")
+	}
+}