FEAT-14a: Charakterbogen on Gerbil (traits + note) + sale-ad request extension

- Gerbil.CharacterTraits (List<string>, JSON text column, opaque labels) + CharacterNote
  (string?). On GerbilDto + Input; round-trips on GET/POST/PUT. Additive migration.
- SaleAdAnimal gains Traits (German labels) + CharacterNote; prompt builder emits
  "Charakter: …" + "Charakter-Notiz: …" lines for the AI Verkaufstext.
- Tests: traits/note round-trip (POST->GET via SQLite host), empty-default, prompt inclusion.

GerbilManagerWebAPI/ApplicationContext.cs

@@ -49,6 +49,19 @@ public class ApplicationContext : DbContext
             e.Property(g => g.Gender).HasConversion<string>();
             e.Property(g => g.Status).HasConversion<string>();
 
+            // FEAT-14: character traits stored as a JSON text column (works on both
+            // Npgsql and the SQLite test host; opaque labels, no backend vocabulary).
+            var traitsConverter = new Microsoft.EntityFrameworkCore.Storage.ValueConversion.ValueConverter<List<string>, string>(
+                v => System.Text.Json.JsonSerializer.Serialize(v, (System.Text.Json.JsonSerializerOptions?)null),
+                v => string.IsNullOrEmpty(v)
+                    ? new List<string>()
+                    : System.Text.Json.JsonSerializer.Deserialize<List<string>>(v, (System.Text.Json.JsonSerializerOptions?)null) ?? new List<string>());
+            var traitsComparer = new Microsoft.EntityFrameworkCore.ChangeTracking.ValueComparer<List<string>>(
+                (a, b) => (a ?? new List<string>()).SequenceEqual(b ?? new List<string>()),
+                v => v == null ? 0 : v.Aggregate(0, (h, s) => HashCode.Combine(h, s.GetHashCode())),
+                v => v.ToList());
+            e.Property(g => g.CharacterTraits).HasConversion(traitsConverter, traitsComparer);
+
             e.HasOne(g => g.Litter).WithMany()
                 .HasForeignKey(g => g.LitterId).OnDelete(DeleteBehavior.SetNull);
             e.HasOne(g => g.OriginContact).WithMany()

GerbilManagerWebAPI/Dtos/ApiDtos.cs

@@ -25,7 +25,9 @@ namespace GerbilManagerWebAPI.Dtos
         string? Notes,
         string? ImportSource,
         string? ExternalRef,
-        string? OriginBreeder);
+        string? OriginBreeder,
+        List<string> CharacterTraits,
+        string? CharacterNote);
 
     public record LitterDto(
         Guid Id,
@@ -71,7 +73,9 @@ namespace GerbilManagerWebAPI.Dtos
         string? Notes,
         string? ImportSource,
         string? ExternalRef,
-        string? OriginBreeder);
+        string? OriginBreeder,
+        List<string>? CharacterTraits,
+        string? CharacterNote);
 
     public record LitterInput(
         string Name,

GerbilManagerWebAPI/Endpoints/GerbilEndpoints.cs

@@ -95,11 +95,14 @@ namespace GerbilManagerWebAPI.Endpoints
             g.ImportSource = i.ImportSource;
             g.ExternalRef = i.ExternalRef;
             g.OriginBreeder = i.OriginBreeder;
+            g.CharacterTraits = i.CharacterTraits ?? new List<string>();
+            g.CharacterNote = i.CharacterNote;
         }
 
         internal static GerbilDto ToDto(Gerbil g) => new(
             g.Id, g.Name, g.Gender, g.Status, g.LitterId, g.OriginContactId, g.ReceiverContactId,
             g.EnclosureId, g.ColorVarietyId, g.DateOfBirth, g.DateOfDeath, g.CauseOfDeath,
-            g.GoHomeDate, g.Genotype, g.Notes, g.ImportSource, g.ExternalRef, g.OriginBreeder);
+            g.GoHomeDate, g.Genotype, g.Notes, g.ImportSource, g.ExternalRef, g.OriginBreeder,
+            g.CharacterTraits, g.CharacterNote);
     }
 }

GerbilManagerWebAPI/Migrations/20260606070929_AddCharacterFields.cs

@@ -0,0 +1,39 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace GerbilManagerWebAPI.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddCharacterFields : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "CharacterNote",
+                table: "Gerbils",
+                type: "text",
+                nullable: true);
+
+            migrationBuilder.AddColumn<string>(
+                name: "CharacterTraits",
+                table: "Gerbils",
+                type: "text",
+                nullable: false,
+                defaultValue: "");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "CharacterNote",
+                table: "Gerbils");
+
+            migrationBuilder.DropColumn(
+                name: "CharacterTraits",
+                table: "Gerbils");
+        }
+    }
+}

GerbilManagerWebAPI/Migrations/ApplicationContextModelSnapshot.cs

@@ -661,6 +661,13 @@ namespace GerbilManagerWebAPI.Migrations
                     b.Property<string>("CauseOfDeath")
                         .HasColumnType("text");
 
+                    b.Property<string>("CharacterNote")
+                        .HasColumnType("text");
+
+                    b.Property<string>("CharacterTraits")
+                        .IsRequired()
+                        .HasColumnType("text");
+
                     b.Property<Guid?>("ColorVarietyId")
                         .HasColumnType("uuid");
 

GerbilManagerWebAPI/Models/Gerbil.cs

@@ -60,6 +60,13 @@ namespace GerbilManagerWebAPI.Models
         /// Kept in sync automatically on save (see ApplicationContext.SaveChanges). Gridify-filterable
         /// so "clan kleine chaoten" matches "Clan-Kleine-Chaoten" (client strips separators too).</summary>
         public string? NameSearch { get; set; }
+
+        /// <summary>FEAT-14: Charakterbogen trait labels (opaque to the backend — the
+        /// {key,label} vocabulary lives frontend-side). Stored as a JSON text column.</summary>
+        public List<string> CharacterTraits { get; set; } = new();
+
+        /// <summary>FEAT-14: free-text character note; feeds the AI Verkaufstext.</summary>
+        public string? CharacterNote { get; set; }
     }
 
     /// <summary>Shared normalisation for the separator-insensitive name search.</summary>

GerbilManagerWebAPI/SaleAd/SaleAdModels.cs

@@ -9,7 +9,11 @@ namespace GerbilManagerWebAPI.SaleAd
         string? Farbschlag,
         /// <summary>ISO "YYYY-MM-DD" (frontend sends the DTO string verbatim).</summary>
         string? DateOfBirth,
-        string? Notes);
+        string? Notes,
+        /// <summary>FEAT-14: Charakterbogen trait LABELS (German, human-readable) for the prompt.</summary>
+        List<string>? Traits = null,
+        /// <summary>FEAT-14: free-text character note for the prompt.</summary>
+        string? CharacterNote = null);
 
     public sealed record SaleAdRequest(
         List<SaleAdAnimal> Animals,

GerbilManagerWebAPI/SaleAd/SaleAdPromptBuilder.cs

@@ -87,6 +87,10 @@ namespace GerbilManagerWebAPI.SaleAd
                     sb.Append($" | geboren am {FormatGermanDate(animal.DateOfBirth)}");
                 if (!string.IsNullOrWhiteSpace(animal.Notes))
                     sb.Append($" | Notizen: {animal.Notes}");
+                if (animal.Traits is { Count: > 0 })
+                    sb.Append($" | Charakter: {string.Join(", ", animal.Traits)}");
+                if (!string.IsNullOrWhiteSpace(animal.CharacterNote))
+                    sb.Append($" | Charakter-Notiz: {animal.CharacterNote}");
                 sb.AppendLine();
             }
             if (!string.IsNullOrWhiteSpace(request.Hints))