To https://www.reddit.com/r/dgraph/comments/dy72j4/storing_edges_current_and_past/

mutation.json

{
	"set": [{
			"uid": "_:DA-Mavericks",
			"name": "Dallas Mavericks",
			"dgraph.type": "Team"
		}, {
			"uid": "_:BO-Celtics",
			"name": "Boston Celtics",
			"dgraph.type": "Team"
		}, {
			"uid": "_:DE-Pistons",
			"name": "Detroit Pistons",
			"dgraph.type": "Team"
		}, {
			"uid": "_:LA-Lakers",
			"name": "Los Angeles Lakers",
			"dgraph.type": "Team"
		},
		{
			"name": "Marcus",
			"dgraph.type": "Player",
			"Seasons": [{
				"firstSeason": "true",
				"start": "2018",
				"to": "present",
				"by_the": {
					"uid": "_:LA-Lakers"
				},
				"Season_Statistics": "Here you can link to some Statistics for this season []",
				"dgraph.type": "Season"
			}]
		},
		{
			"name": "Lucas",
			"dgraph.type": "Player",
			"Seasons": [{
				"firstSeason": "true",
				"start": "2010",
				"to": "2019",
				"by_the": {
					"uid": "_:DE-Pistons"
				},
				"Season_Statistics": "Link here to some Statistics []",
				"dgraph.type": "Season"
			}, {
				"firstSeason": "false",
				"start": "2019",
				"to": "present",
				"by_the": {
					"uid": "_:LA-Lakers"
				},
				"Season_Statistics": "Link here to some Statistics []",
				"dgraph.type": "Season"
			}]
		},
		{
			"name": "Tom",
			"dgraph.type": "Player",
			"Seasons": [{
					"firstSeason": "true",
					"start": "2008",
					"to": "2016",
					"by_the": {
						"uid": "_:BO-Celtics"
					},
					"Season_Statistics": "Link here to some Statistics []",
					"dgraph.type": "Season"
				},
				{
					"firstSeason": "false",
					"start": "2016",
					"to": "2019",
					"by_the": {
						"uid": "_:LA-Lakers"
					},
					"Season_Statistics": "Link here to some Statistics []",
					"dgraph.type": "Season"
				},
				{
					"firstSeason": "false",
					"start": "2019",
					"to": "present",
					"by_the": {
						"uid": "_:DA-Mavericks"
					},
					"Season_Statistics": "Link here to some Statistics []",
					"dgraph.type": "Season"
				}
			]
		}, {
			"name": "Patrick",
			"dgraph.type": "Player",
			"Seasons": [{
				"firstSeason": "true",
				"start": "2011",
				"to": "present",
				"by_the": {
					"uid": "_:BO-Celtics"
				},
				"Season_Statistics": "Link here to some Statistics []",
				"dgraph.type": "Season"
			}]
		}
	]
}

query.txt

{
	query(func: type(Player)) {
		uid
		name
		Seasons (orderasc: start) {
			firstSeason
			start
			to
			by_the {
				name
			}
			Season_Statistics
		}
	}
}

Type.schema

type Team {
	name: string
}

type Player {
	name: string
	Seasons: [uid]
}

type Season {
	firstSeason: bool
	start: datetime
	to: string
	by_the: [uid]
	Season_Statistics: string
}