DB.Set and .Get should accept any as key for context.

[benjajaja]

See https://pkg.go.dev/context#Context:

...packages should define keys as an unexported type to avoid
collisions.

// Package user defines a User type that's stored in Contexts.
package user

import "context"

// User is the type of value stored in the Contexts.
type User struct {...}

// key is an unexported type for keys defined in this package.
// This prevents collisions with keys defined in other packages.
type key int

// userKey is the key for user.User values in Contexts. It is
// unexported; clients use user.NewContext and user.FromContext
// instead of using this key directly.
var userKey key

// NewContext returns a new Context that carries value u.
func NewContext(ctx context.Context, u *User) context.Context {
    return context.WithValue(ctx, userKey, u)
}

// FromContext returns the User value stored in ctx, if any.
func FromContext(ctx context.Context) (*User, bool) {
    u, ok := ctx.Value(userKey).(*User)
    return u, ok
}