Rename -days flag to -sync-lookback-days

Clarifies that this flag controls how far back the GitHub API sync
fetches, not what appears in the report. The -since flag controls
report filtering independently.

- Renamed flag from -days to -sync-lookback-days
- Updated flag description for clarity
- Updated all test references
- Updated README.md documentation
- Kept default value at 30 days

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: justinabrahms

README.md

@@ -40,7 +40,7 @@ gitstreams
 | `-token` | GitHub token (default: `$GITHUB_TOKEN`) |
 | `-db` | Path to SQLite database (default: `~/.gitstreams/gitstreams.db`) |
 | `-report` | Path to write HTML report (default: temp file) |
-| `-days` | Number of days to look back for activity (1-365, default: 30) |
+| `-sync-lookback-days` | How far back to fetch GitHub data (1-365 days, default: 30) |
 | `-offline` | Skip GitHub API sync and use cached data |
 | `-no-notify` | Skip desktop notification |
 | `-no-open` | Don't open report in browser |
@@ -55,8 +55,8 @@ gitstreams -no-notify -no-open -report ~/reports/today.html
 # Verbose mode with custom database
 gitstreams -v -db /path/to/my.db
 
-# Only show activity from the last 7 days
-gitstreams -days 7
+# Fetch GitHub data from the last 7 days
+gitstreams -sync-lookback-days 7
 
 # Use cached data without hitting GitHub API (fast, but may be stale)
 gitstreams -offline

main.go

@@ -40,7 +40,7 @@ type Config struct {
 	Token      string
 	ReportPath string
 	Since      string // Generate report from this date (e.g., '2026-01-15' or '7d')
-	Days       int    // Number of days to look back for activity (default 30)
+	Days       int    // How far back to fetch GitHub data (API sync lookback, default 30)
 	NoNotify   bool
 	NoOpen     bool
 	Verbose    bool
@@ -373,7 +373,7 @@ func parseFlags(args []string) (*Config, error) {
 	fs.StringVar(&cfg.ReportPath, "report", "", "Path to write HTML report (default: temp file)")
 	fs.BoolVar(&cfg.Verbose, "v", false, "Verbose output")
 	fs.BoolVar(&showVersion, "version", false, "Print version and exit")
-	fs.IntVar(&cfg.Days, "days", 30, "Number of days to look back for activity (1-365)")
+	fs.IntVar(&cfg.Days, "sync-lookback-days", 30, "How far back to fetch GitHub data (1-365 days, doesn't affect report filtering)")
 	fs.StringVar(&cfg.Since, "since", "", "Generate report from historical data (e.g., '2026-01-15' or '7d' for 7 days ago)")
 	fs.BoolVar(&cfg.Offline, "offline", false, "Use only cached data, skip GitHub API calls")
 

main_test.go

@@ -1023,7 +1023,7 @@ func TestRun_DaysFlag(t *testing.T) {
 	result := run(&stdout, &stderr, []string{
 		"-token", "test-token",
 		"-db", filepath.Join(tmpDir, "test.db"),
-		"-days", "7",
+		"-sync-lookback-days", "7",
 		"-no-open",
 		"-no-notify",
 	}, deps)
@@ -1041,7 +1041,7 @@ func TestRun_DaysFlagInvalid(t *testing.T) {
 	// Test with invalid days (too low)
 	result := run(&stdout, &stderr, []string{
 		"-token", "test-token",
-		"-days", "0",
+		"-sync-lookback-days", "0",
 	}, deps)
 
 	if result != 1 {
@@ -1056,7 +1056,7 @@ func TestRun_DaysFlagInvalid(t *testing.T) {
 	stderr.Reset()
 	result = run(&stdout, &stderr, []string{
 		"-token", "test-token",
-		"-days", "400",
+		"-sync-lookback-days", "400",
 	}, deps)
 
 	if result != 1 {