Filters: words and posts a persona would rather not see

Mastodon's v2 filters replace the empty stubs: a filter's title, contexts,
action (warn, hide, blur) and expiry, its keywords (whole words or not,
taken as JSON objects, listed or numbered form fields, with id and _destroy
on update) and its statuses, each with their own endpoints; the v1 API is
the same filters seen keyword by keyword. Every status a persona reads
carries the filters it matches in `filtered` (a boost as what it boosts),
matched as Mastodon matches: warning, title, text, poll options and media
descriptions. Clients apply context and action. Filters never federate, and
go with a deleted persona.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub/Models/Social/Filters.cs

@@ -0,0 +1,50 @@
+using MongoDB.Entities;
+
+namespace PrivaPub.Models.Social
+{
+	//a persona's filter (Mastodon's v2 filters, owner decision 2026-10-04): words and posts it would rather not see, in
+	//some contexts, to be warned about, hidden or blurred. Statuses carry the filters they match (`filtered`) and the client
+	//applies context and action, as Mastodon's do. Filters are the persona's own and never federate.
+	public class PersonaFilter : Entity
+	{
+		public string AvatarId { get; set; }
+		public string Title { get; set; }
+		public List<string> Context { get; set; } = new();
+		public DateTime? ExpiresAt { get; set; }
+		public string Action { get; set; } = FilterActions.Warn;
+		public List<FilterKeyword> Keywords { get; set; } = new();
+		public List<FilterStatus> Statuses { get; set; } = new();
+		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+		public bool IsActive(DateTime now) => ExpiresAt == default || ExpiresAt > now;
+	}
+
+	public class FilterKeyword
+	{
+		public string Id { get; set; }
+		public string Keyword { get; set; }
+		public bool WholeWord { get; set; }
+	}
+
+	public class FilterStatus
+	{
+		public string Id { get; set; }
+		public string PostId { get; set; }
+	}
+
+	public static class FilterActions
+	{
+		public const string Warn = "warn";
+		public const string Hide = "hide";
+		public const string Blur = "blur";
+
+		public static bool IsValid(string value) => value is Warn or Hide or Blur;
+	}
+
+	public static class FilterContexts
+	{
+		public static readonly string[] All = { "home", "notifications", "public", "thread", "account" };
+
+		public static bool IsValid(string value) => All.Contains(value);
+	}
+}