feat: add ring buffers

internal/ratelimit/category.go

@@ -57,3 +57,47 @@ func (c Category) String() string {
 		return rv
 	}
 }
+
+// Priority represents the importance level of a category for buffer management.
+type Priority int
+
+const (
+	PriorityCritical Priority = iota + 1
+	PriorityHigh
+	PriorityMedium
+	PriorityLow
+	PriorityLowest
+)
+
+func (p Priority) String() string {
+	switch p {
+	case PriorityCritical:
+		return "critical"
+	case PriorityHigh:
+		return "high"
+	case PriorityMedium:
+		return "medium"
+	case PriorityLow:
+		return "low"
+	case PriorityLowest:
+		return "lowest"
+	default:
+		return "unknown"
+	}
+}
+
+// GetPriority returns the priority level for this category.
+func (c Category) GetPriority() Priority {
+	switch c {
+	case CategoryError:
+		return PriorityCritical
+	case CategoryMonitor:
+		return PriorityHigh
+	case CategoryLog:
+		return PriorityMedium
+	case CategoryTransaction:
+		return PriorityLow
+	default:
+		return PriorityMedium
+	}
+}

internal/ratelimit/category_test.go

@@ -60,3 +60,42 @@ func TestKnownCategories(t *testing.T) {
 		})
 	}
 }
+
+func TestPriority_String(t *testing.T) {
+	tests := []struct {
+		priority Priority
+		expected string
+	}{
+		{PriorityCritical, "critical"},
+		{PriorityHigh, "high"},
+		{PriorityMedium, "medium"},
+		{PriorityLow, "low"},
+		{PriorityLowest, "lowest"},
+		{Priority(999), "unknown"},
+	}
+
+	for _, tt := range tests {
+		if got := tt.priority.String(); got != tt.expected {
+			t.Errorf("Priority(%d).String() = %q, want %q", tt.priority, got, tt.expected)
+		}
+	}
+}
+
+func TestCategory_GetPriority(t *testing.T) {
+	tests := []struct {
+		category Category
+		expected Priority
+	}{
+		{CategoryError, PriorityCritical},
+		{CategoryMonitor, PriorityHigh},
+		{CategoryLog, PriorityMedium},
+		{CategoryTransaction, PriorityLow},
+		{Category("unknown"), PriorityMedium},
+	}
+
+	for _, tt := range tests {
+		if got := tt.category.GetPriority(); got != tt.expected {
+			t.Errorf("Category(%q).GetPriority() = %s, want %s", tt.category, got, tt.expected)
+		}
+	}
+}