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/apis/logs.go

@@ -0,0 +1,73 @@
+package apis
+
+import (
+	"net/http"
+
+	"github.com/pocketbase/dbx"
+	"github.com/pocketbase/pocketbase/core"
+	"github.com/pocketbase/pocketbase/tools/router"
+	"github.com/pocketbase/pocketbase/tools/search"
+)
+
+// bindLogsApi registers the request logs api endpoints.
+func bindLogsApi(app core.App, rg *router.RouterGroup[*core.RequestEvent]) {
+	sub := rg.Group("/logs").Bind(RequireSuperuserAuth(), SkipSuccessActivityLog())
+	sub.GET("", logsList)
+	sub.GET("/stats", logsStats)
+	sub.GET("/{id}", logsView)
+}
+
+var logFilterFields = []string{
+	"id", "created", "level", "message", "data",
+	`^data\.[\w\.\:]*\w+$`,
+}
+
+func logsList(e *core.RequestEvent) error {
+	fieldResolver := search.NewSimpleFieldResolver(logFilterFields...)
+
+	result, err := search.NewProvider(fieldResolver).
+		Query(e.App.AuxModelQuery(&core.Log{})).
+		ParseAndExec(e.Request.URL.Query().Encode(), &[]*core.Log{})
+
+	if err != nil {
+		return e.BadRequestError("", err)
+	}
+
+	return e.JSON(http.StatusOK, result)
+}
+
+func logsStats(e *core.RequestEvent) error {
+	fieldResolver := search.NewSimpleFieldResolver(logFilterFields...)
+
+	filter := e.Request.URL.Query().Get(search.FilterQueryParam)
+
+	var expr dbx.Expression
+	if filter != "" {
+		var err error
+		expr, err = search.FilterData(filter).BuildExpr(fieldResolver)
+		if err != nil {
+			return e.BadRequestError("Invalid filter format.", err)
+		}
+	}
+
+	stats, err := e.App.LogsStats(expr)
+	if err != nil {
+		return e.BadRequestError("Failed to generate logs stats.", err)
+	}
+
+	return e.JSON(http.StatusOK, stats)
+}
+
+func logsView(e *core.RequestEvent) error {
+	id := e.Request.PathValue("id")
+	if id == "" {
+		return e.NotFoundError("", nil)
+	}
+
+	log, err := e.App.FindLogById(id)
+	if err != nil || log == nil {
+		return e.NotFoundError("", err)
+	}
+
+	return e.JSON(http.StatusOK, log)
+}