ActionCable vs Firehose

Fire-and-forget vs. reliable delivery

	ActionCable	Firehose
Backend	Redis, SolidCable, AnyCable	✓ Postgres
Messages	✗ Fire and forget	✓ Persisted
Sequencing	✗ None	✓ Per-channel
Reconnect	✗ Messages lost	✓ Replay from last ID

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