Redis

• New stream entryRuns for each entry added to a Redis stream. Entries already on the stream when the workflow is turned on don't run it.

• Get valueRead the text stored under a key, and how long until it expires. A missing key comes back with 'found' false rather than failing.
• Set valueStore text, a number or JSON under a key, replacing what is there. It can expire after some seconds or at a moment, and can be stored only if the key is new (for a lock) or only if it already exists.
• Delete keysDelete one or more keys, whatever they hold. Missing keys are skipped.
• Check keyFind out whether a key exists, what kind of value it holds (string, list, hash, set, sorted set or stream) and when it expires.
• Find keysList the keys whose names match a pattern, such as order:* for every key starting order:. Safe on a busy server: Redis is read in small steps.
• Set expiryMake a key expire after some seconds or at a moment. With neither, the key's expiry is removed so it is kept.
• Increment numberAdd to the number stored under a key and get the new number. A missing key starts at 0. Use a negative amount to count down.
• Add to listAdd items to the end (or start) of a list, creating the list if needed. Handy as a simple queue.
• Take from listTake items off the start (or end) of a list, removing them. With items added at the end, this takes the oldest first.
• Get list itemsRead a list's items by position without removing them. Positions start at 0; -1 is the last item.
• Set hash fieldsSet named fields of a hash, a record stored under one key, creating it if needed. Other fields are left as they are.
• Get hash fieldsRead every field of a hash, or only the ones named.
• Delete hash fieldsRemove named fields from a hash. The hash is deleted once it has none.
• Add to setAdd members to a set, a collection without repeats. A member already in it is not added twice.
• Get set membersList a set's members, and check whether one value is among them.
• Remove from setRemove members from a set. The set is deleted once it is empty.
• Publish messageSend a message to a channel. Only programs subscribed at that moment receive it; nothing is kept. To keep messages, add them to a stream.
• Add stream entryAppend an entry of named fields to a stream, a log that keeps every entry in order. Creates the stream if needed.
• Read stream entriesRead a stream's entries without removing them: from the oldest, or the newest first, and only those after an entry ID if given.
• Run commandSend any other Redis command, such as ZADD for a leaderboard or GEOSEARCH, with its arguments. Commands that wipe or stop the server are refused.

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