types/model: remove (*Digest).Scan and Digest.Value (#3605)

types/model/digest.go

 package model
 
 import (
-	"database/sql"
-	"database/sql/driver"
-	"errors"
-	"fmt"
 	"log/slog"
 	"strings"
 	"unicode"
@@ -44,32 +40,9 @@ func (d Digest) LogValue() slog.Value {
 }
 
 var (
-	_ driver.Valuer  = Digest{}
-	_ sql.Scanner    = (*Digest)(nil)
 	_ slog.LogValuer = Digest{}
 )
 
-// Scan implements the sql.Scanner interface.
-func (d *Digest) Scan(src any) error {
-	if d.IsValid() {
-		return errors.New("model.Digest: illegal Scan on valid Digest")
-	}
-	switch v := src.(type) {
-	case string:
-		*d = ParseDigest(v)
-		return nil
-	case []byte:
-		*d = ParseDigest(string(v))
-		return nil
-	}
-	return fmt.Errorf("model.Digest: invalid Scan source %T", src)
-}
-
-// Value implements the driver.Valuer interface.
-func (d Digest) Value() (driver.Value, error) {
-	return d.String(), nil
-}
-
 // ParseDigest parses a string in the form of "<digest-type>-<digest>" into a
 // Digest.
 func ParseDigest(s string) Digest {