Neo4j Best Practice for Index on Relationship Property? - postgresql

Question

I'm trying to migrate a PostgreSQL database to Neo4j and have the following m-n relationship in PostgreSQL:
user-(blocked)-user
So in PostgreSQL I have an extra table "blocked" that has the following columns: userid1, userid2, blockedsince, blockeduntil
I also have an index on blocked.blockeduntil to search for rows that eventually must be removed when the blocking is over.
How can I build this relationship including the index in Neo4j?
I already included all user-rows in a node type "user" in Neo4j.
Next step would have been to create a relationship called "blocked" from user to user.
So basically like this: (user)-[:blocked]->(user)
I would have added the 2 relationship properties "blockeduntil" and "blockedsince" to the relationship. But it does not seem to be possible to create an index on the relationship property blocked.blockeduntil
Original code for PostgreSQL:
CREATE TABLE user (
UserId bigserial NOT NULL PRIMARY KEY,
...
);
CREATE TABLE blocked(
UserId1 bigint NOT NULL references user(UserId),
UserId2 bigint NOT NULL references user(UserId),
BlockedSince timestamp NOT NULL,
BlockedUntil timestamp NOT NULL,
PRIMARY KEY (UserId1, UserId2)
);
CREATE INDEX "IdxBlocked" on blocked(blockeduntil);
My first approach in Neo4j:
USING PERIODIC COMMIT
LOAD CSV WITH HEADERS FROM "file:///blocked.csv" AS row
MATCH (u1:user {userid: toInteger(row.userid1)})
MATCH (u2:user {userid: toInteger(row.userid2)})
MERGE (u1)-[b:BLOCKED]->(u2)
ON CREATE SET b.blockedsince = localdatetime(replace(row.blockedsince, " ", "T")), b.blockeduntil = localdatetime(replace(row.blockeduntil, " ", "T"));
What is the best practice to achieve this relationship including the index on blockeduntil? Would it be better to create a new node type called "blocked" like this?
USING PERIODIC COMMIT
LOAD CSV WITH HEADERS FROM "file:///blocked.csv" AS row
CREATE (:blocked{userid1: toInteger(row.userid1), userid2: toInteger(row.userid2), blockedsince: localdatetime(replace(row.blockedsince, " ", "T")),
blockeduntil: localdatetime(replace(row.blockeduntil, " ", "T"))});
And then create an index on blocked.blockeduntil like this?
CREATE INDEX ON :blocked(blockeduntil);
During my research I stumbled upon explicit indexes Explicit Indexes but they seem to be deprecated. Also I'm not sure if Full Text Indexes are the right choice here.

Answer 1

Ok, it seems that I found an official answer from a Neo4J staff member.
https://community.neo4j.com/t/how-can-i-use-index-in-relationship/1627/2
From the post:
We instead recommend refactoring your model. If you need to perform an index lookup of something, that usually suggests that thing would be better modeled as a node. As a node you are able to create the indexes and constraints you need for quick lookup.
So I will model "blocked" as a node and create an index on blocked.blockeduntil.