feat: add attach time to volume

.claude/CLAUDE.md

@@ -19,30 +19,10 @@ Each component can be used independently or as part of the integrated Hive stack
 - `../viperblock/CLAUDE.md` - Viperblock development guide
 - `../predastore/CLAUDE.md` - Predastore development guide
 
-## Build Commands
+## Project Standards
 
-### Hive (Platform Orchestrator)
-```bash
-make build          # Build the hive binary
-make test           # Run Go tests
-make bench          # Run benchmarks
-make clean          # Clean build artifacts
-```
-
-### **MANDATORY: Unit Testing Requirements**
-
-**⚠️ CRITICAL: Always run unit tests before any commit or push operation.**
-
-```bash
-# REQUIRED before any git commit or push
-make test           # Must pass with zero failures
-
-# Example workflow:
-make test                    # Verify all tests pass
-git add .                    # Stage changes
-git commit -m "..."          # Only after tests pass
-git push origin main         # Only after tests pass
-```
+- Use log/slog instead of log. Use appropriate log level, eg `slog.Info`
+- All new features must have comprehensive unit tests
 
 **Testing Policy:**
 - **All unit tests MUST pass** before committing changes
@@ -51,25 +31,6 @@ git push origin main         # Only after tests pass
 - Use `make test` command to run the full test suite
 - If tests fail, fix issues before proceeding with git operations
 
-### Component Build Commands
-
-For detailed build instructions, see component-specific CLAUDE.md files:
-
-**Viperblock** (`../viperblock/CLAUDE.md`):
-```bash
-cd ../viperblock && make build    # Build sfs, vblock binaries + NBD plugin
-```
-
-**Predastore** (`../predastore/CLAUDE.md`):
-```bash
-cd ../predastore && make build    # Build s3d binary
-```
-
-**NBDkit** (system dependency):
-```bash
-cd nbdkit && autoreconf -i && ./configure && make && make install
-```
-
 ## Architecture Notes
 
 Read `DESIGN.md` to understand the full architecture

hive/handlers/ec2/volume/service_impl.go

@@ -219,6 +219,7 @@ func (s *VolumeServiceImpl) getVolumeByID(volumeID string) (*ec2.Volume, error)
 				Device:              aws.String(volMeta.DeviceName),
 				State:               aws.String(attachState),
 				DeleteOnTermination: aws.Bool(false),
+				AttachTime:          aws.Time(volMeta.AttachedAt),
 			},
 		}
 	}
@@ -344,6 +345,9 @@ func (s *VolumeServiceImpl) UpdateVolumeState(volumeID, state, attachedInstance
 
 	cfg.VolumeMetadata.State = state
 	cfg.VolumeMetadata.AttachedInstance = attachedInstance
+	if attachedInstance != "" {
+		cfg.VolumeMetadata.AttachedAt = time.Now()
+	}
 
 	if err := s.putVolumeConfig(volumeID, cfg); err != nil {
 		return fmt.Errorf("failed to write volume config for state update: %w", err)