fix: improve date parsing and prevent early return when PR numbers exist

## CHANGES

- Add SQLite datetime formats to version date parsing logic
- Loop through multiple date formats until one succeeds
- Include SQLite fractional seconds format support
- Prevent early return when version has PR numbers to output
- Simplify error handling for date parsing failures

cmd/generate_changelog/internal/cache/cache.go

@@ -202,14 +202,23 @@ func (c *Cache) GetVersions() (map[string]*git.Version, error) {
 		}
 
 		if dateStr.Valid {
-			// Try RFC3339Nano first (for nanosecond precision), then fall back to RFC3339
-			v.Date, err = time.Parse(time.RFC3339Nano, dateStr.String)
-			if err != nil {
-				v.Date, err = time.Parse(time.RFC3339, dateStr.String)
-				if err != nil {
-					fmt.Fprintf(os.Stderr, "Error parsing date '%s' for version '%s': %v. Expected format: RFC3339 or RFC3339Nano.\n", dateStr.String, v.Name, err)
+			// Try multiple date formats: SQLite format, RFC3339Nano, and RFC3339
+			dateFormats := []string{
+				"2006-01-02 15:04:05-07:00",   // SQLite DATETIME format
+				"2006-01-02 15:04:05.999999999-07:00", // SQLite with fractional seconds
+				time.RFC3339Nano,
+				time.RFC3339,
+			}
+			var parseErr error
+			for _, format := range dateFormats {
+				v.Date, parseErr = time.Parse(format, dateStr.String)
+				if parseErr == nil {
+					break // Successfully parsed
 				}
 			}
+			if parseErr != nil {
+				fmt.Fprintf(os.Stderr, "Error parsing date '%s' for version '%s': %v\n", dateStr.String, v.Name, parseErr)
+			}
 		}
 
 		if prNumbersJSON != "" {

cmd/generate_changelog/internal/changelog/generator.go

@@ -470,7 +470,8 @@ func (g *Generator) generateRawVersionContent(version *git.Version) string {
 	}
 
 	// There are occasionally no PRs or direct commits other than version bumps, so we handle that gracefully
-	if len(prCommits) == 0 && len(directCommits) == 0 {
+	// However, don't return early if we have PRs to output from version.PRNumbers
+	if len(prCommits) == 0 && len(directCommits) == 0 && len(version.PRNumbers) == 0 {
 		return ""
 	}