diff --git a/loglens/formatters/text_formatter.py b/loglens/formatters/text_formatter.py
index 8cf8717..66fd951 100644
--- a/loglens/formatters/text_formatter.py
+++ b/loglens/formatters/text_formatter.py
@@ -1,18 +1,17 @@
-"""Text output formatter."""
+'''Text output formatter.'''
 
-from datetime import datetime
-from typing import Any, List
+from typing import Any
 
 from loglens.analyzers.analyzer import AnalysisResult
-from loglens.parsers.base import ParsedLogEntry
 from loglens.formatters.base import OutputFormatter
+from loglens.parsers.base import ParsedLogEntry
 
 
 class TextFormatter(OutputFormatter):
-    """Simple text output formatter."""
+    '''Simple text output formatter.'''
 
     def format(self, data: Any) -> str:
-        """Format data as text."""
+        '''Format data as text.'''
         if isinstance(data, AnalysisResult):
             return self._format_analysis_result(data)
         elif isinstance(data, list):
@@ -21,7 +20,7 @@ class TextFormatter(OutputFormatter):
             return str(data)
 
     def _format_analysis_result(self, result: AnalysisResult) -> str:
-        """Format analysis result as text summary."""
+        '''Format analysis result as text summary.'''
         lines = []
         lines.append("=" * 60)
         lines.append("LOG ANALYSIS SUMMARY")
@@ -58,8 +57,8 @@ class TextFormatter(OutputFormatter):
 
         return "\n".join(lines)
 
-    def _format_entries(self, entries: List[ParsedLogEntry]) -> str:
-        """Format log entries as text lines."""
+    def _format_entries(self, entries: list[ParsedLogEntry]) -> str:
+        '''Format log entries as text lines.'''
         lines = []
         for entry in entries:
             parts = []
@@ -79,8 +78,8 @@ class TextFormatter(OutputFormatter):
 
         return "\n".join(lines)
 
-    def format_entries_compact(self, entries: List[ParsedLogEntry], max_lines: int = 100) -> str:
-        """Format entries compactly."""
+    def format_entries_compact(self, entries: list[ParsedLogEntry], max_lines: int = 100) -> str:
+        '''Format entries compactly.'''
         lines = []
         for entry in entries[:max_lines]:
             severity = (entry.severity or "?").upper()[0]