diff --git a/db/metrics_test.go b/db/metrics_test.go
new file mode 100644
index 000000000..c61314f19
--- /dev/null
+++ b/db/metrics_test.go
@@ -0,0 +1,86 @@
+package db
+
+import (
+	"math"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCalculateAverageDays(t *testing.T) {
+	const SecondsToDateConversion = 86400
+	tests := []struct {
+		name      string
+		paidCount int64
+		paidSum   uint
+		expected  uint
+	}{
+		{
+			name:      "Standard Input",
+			paidCount: 10,
+			paidSum:   1000,
+			expected:  uint(math.Round(float64(1000/10) / float64(SecondsToDateConversion))),
+		},
+		{
+			name:      "Zero Paid Count",
+			paidCount: 0,
+			paidSum:   1000,
+			expected:  0,
+		},
+		{
+			name:      "Zero Paid Sum",
+			paidCount: 10,
+			paidSum:   0,
+			expected:  0,
+		},
+		{
+			name:      "Both Zero",
+			paidCount: 0,
+			paidSum:   0,
+			expected:  0,
+		},
+		{
+			name:      "Minimum Positive Values",
+			paidCount: 1,
+			paidSum:   1,
+			expected:  0,
+		},
+		{
+			name:      "Large Paid Count and Sum",
+			paidCount: 1000000,
+			paidSum:   1000000000,
+			expected:  uint(math.Round(float64(1000000000/1000000) / float64(SecondsToDateConversion))),
+		},
+		{
+			name:      "Paid Count Greater than Paid Sum",
+			paidCount: 1000,
+			paidSum:   500,
+			expected:  0,
+		},
+		{
+			name:      "Paid Sum Exactly Divisible by Paid Count",
+			paidCount: 5,
+			paidSum:   100,
+			expected:  uint(math.Round(float64(100/5) / float64(SecondsToDateConversion))),
+		},
+		{
+			name:      "Paid Sum Not Divisible by Paid Count",
+			paidCount: 3,
+			paidSum:   100,
+			expected:  uint(math.Round(float64(100/3) / float64(SecondsToDateConversion))),
+		},
+		{
+			name:      "Zero Result Due to Seconds Conversion",
+			paidCount: 10,
+			paidSum:   100,
+			expected:  0,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := CalculateAverageDays(tt.paidCount, tt.paidSum)
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}