Sorry for the delay in responding.
Here are some answers:
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Views are not supported in markdown, so it’s not possible yet. But this topic might be interesting: How to create a dynamic link that shows a view filtered by current entity?
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No, this isn’t directly possible with view filters, but you could use filters in relation views to create a subset collection of DB1 entities for each DB2 entity. Or use a formula to identify (with a checkbox = true) any DB1 entities that are within 7 days of their linked DB2, and then use this field in view filters.
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No
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Synced blocks (aka transclusion) is not supported in Fibery, but the references (and the upcoming ‘highlights’ feature) may help in some use cases.
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Yes and no. Some things (embedded items) have handles for moving them around, but at the moment, simple paragraphs of text do not.
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No
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Not sure what you mean. I think the answer is no. Maybe linked highlights are better in some cases than mentions
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No, but there are many aggregation functions. What do you want to achieve?
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I’ll let other community members chip in with their opinions, but IMHO Notion is better if all you need is notes/text. Fibery is strong when you also need structured data (and want to collaborate). There are other tools that may be better than both Fibery and Notion, if traditional task management is your primary/sole use case.