1 files changed, 31 insertions, 0 deletions
diff --git a/internal/actions/types.go b/internal/actions/types.go
new file mode 100644
index 0000000..899583b
--- /dev/null
+++ b/internal/actions/types.go
@@ -0,0 +1,31 @@
+package actions
+
+import (
+	"errors"
+	"time"
+)
+
+// Common errors
+var (
+	ErrNoActiveTimer         = errors.New("no active timer found")
+	ErrClientRequired        = errors.New("client is required")
+	ErrClientNotFound        = errors.New("client not found")
+	ErrProjectNotFound       = errors.New("project not found")
+	ErrAmbiguousClient       = errors.New("ambiguous client reference")
+	ErrAmbiguousProject      = errors.New("ambiguous project reference")
+	ErrProjectClientMismatch = errors.New("project does not belong to specified client")
+	ErrNoRecentEntries       = errors.New("no previous time entries found")
+)
+
+// TimerSession represents an active or completed time tracking session
+type TimerSession struct {
+	ID             int64
+	ClientName     string
+	ProjectName    string // empty if no project
+	Description    string // empty if no description
+	StartTime      time.Time
+	EndTime        *time.Time // nil if still active
+	Duration       time.Duration
+	WasNoOp        bool   // true if timer was already active with same parameters
+	StoppedEntryID *int64 // ID of previously stopped entry (if any)
+}
+\ No newline at end of file