Add market value: tiered prices and an eBay Browse provider
Researched the options first. PriceCharting is the standard for retro prices
but requires a paid subscription for both its API and its bulk download.
eBay's sold-price data sits behind the Marketplace Insights API, which is a
limited release closed to new developers. The free game-price APIs cover
current digital storefronts, not physical retro copies. So there is no free
route to sold prices, and this uses eBay Browse — active listings, which are
asking prices, labelled as such rather than presented as valuations.
Schema now holds three prices per game (loose, CIB, new), with marketValue
as whichever tier matches that copy's condition. Changing a condition
re-prices from the stored tiers with no further lookup, and the dashboard
can later show both actual value and what a collection would be worth
complete.
The judgement lives in classification and aggregation, both pure and both
tested without credentials:
* listings are sorted into tiers from their titles, and accessories,
reproductions and multi-game lots are discarded — a "box only" listing
at $45 counted as a copy would halve the loose estimate for a $130 cart
* the discard qualifier is required. The first version matched a bare
"box", which threw out "complete in box" and "with box and manual",
i.e. most of the CIB tier, while keeping exactly the listings the
filter existed to remove. A test asserting on tiers rather than counts
caught it.
* median with an interquartile trim, since one optimist asking 50x moves
a mean and not a median
* sample counts travel with the estimate, because a tier drawn from two
listings warrants less confidence than one drawn from thirty
Credentials are optional: with none set, /api/prices/status reports
configured=false and refresh answers 503 with instructions, while the rest
of the app is unaffected.
101 backend tests.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Claude Opus 5
@@ -32,6 +32,9 @@ public class LudosDbContext(DbContextOptions<LudosDbContext> options)
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game.Property(g => g.PurchasePrice).HasConversion(moneyToCents);
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game.Property(g => g.MarketValue).HasConversion(moneyToCents);
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game.Property(g => g.ValueLoose).HasConversion(moneyToCents);
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game.Property(g => g.ValueCib).HasConversion(moneyToCents);
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game.Property(g => g.ValueNew).HasConversion(moneyToCents);
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// Stored as an enum's underlying int; readable names live in the API.
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game.Property(g => g.Condition).HasConversion<int>();
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+406
@@ -0,0 +1,406 @@
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// <auto-generated />
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using System;
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using LudosData.Api.Data;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.EntityFrameworkCore.Infrastructure;
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using Microsoft.EntityFrameworkCore.Migrations;
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using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
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#nullable disable
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namespace LudosData.Api.Data.Migrations
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{
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[DbContext(typeof(LudosDbContext))]
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[Migration("20260804191736_AddTieredPrices")]
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partial class AddTieredPrices
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{
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/// <inheritdoc />
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protected override void BuildTargetModel(ModelBuilder modelBuilder)
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{
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#pragma warning disable 612, 618
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modelBuilder.HasAnnotation("ProductVersion", "10.0.10");
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modelBuilder.Entity("LudosData.Api.Domain.AppUser", b =>
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{
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b.Property<string>("Id")
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.HasColumnType("TEXT");
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b.Property<int>("AccessFailedCount")
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.HasColumnType("INTEGER");
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b.Property<string>("Art")
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.HasColumnType("TEXT");
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b.Property<string>("ConcurrencyStamp")
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.IsConcurrencyToken()
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.HasColumnType("TEXT");
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b.Property<DateTimeOffset>("CreatedAt")
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.HasColumnType("TEXT");
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b.Property<string>("Email")
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.HasMaxLength(256)
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.HasColumnType("TEXT");
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b.Property<bool>("EmailConfirmed")
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.HasColumnType("INTEGER");
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b.Property<string>("FirstName")
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.HasColumnType("TEXT");
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b.Property<string>("LastName")
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.HasColumnType("TEXT");
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b.Property<bool>("LockoutEnabled")
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.HasColumnType("INTEGER");
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b.Property<DateTimeOffset?>("LockoutEnd")
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.HasColumnType("TEXT");
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b.Property<string>("NormalizedEmail")
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.HasMaxLength(256)
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.HasColumnType("TEXT");
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b.Property<string>("NormalizedUserName")
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.HasMaxLength(256)
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.HasColumnType("TEXT");
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b.Property<string>("PasswordHash")
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.HasColumnType("TEXT");
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b.Property<string>("PhoneNumber")
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.HasColumnType("TEXT");
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b.Property<bool>("PhoneNumberConfirmed")
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.HasColumnType("INTEGER");
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b.Property<string>("SecurityStamp")
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.HasColumnType("TEXT");
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b.Property<bool>("TwoFactorEnabled")
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.HasColumnType("INTEGER");
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b.Property<string>("UserName")
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.HasMaxLength(256)
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.HasColumnType("TEXT");
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b.HasKey("Id");
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b.HasIndex("NormalizedEmail")
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.HasDatabaseName("EmailIndex");
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b.HasIndex("NormalizedUserName")
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.IsUnique()
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.HasDatabaseName("UserNameIndex");
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b.ToTable("AspNetUsers", (string)null);
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});
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modelBuilder.Entity("LudosData.Api.Domain.Game", b =>
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{
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b.Property<int>("Id")
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.ValueGeneratedOnAdd()
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.HasColumnType("INTEGER");
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b.Property<string>("Art")
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.HasMaxLength(200)
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.HasColumnType("TEXT");
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b.Property<int>("Condition")
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.HasColumnType("INTEGER");
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b.Property<DateTimeOffset>("CreatedAt")
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.HasColumnType("TEXT");
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b.Property<string>("Description")
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.HasColumnType("TEXT");
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b.Property<string>("Developer")
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.HasMaxLength(100)
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.HasColumnType("TEXT");
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b.Property<bool>("Dumped")
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.HasColumnType("INTEGER");
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b.Property<bool>("Finished")
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.HasColumnType("INTEGER");
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b.Property<string>("Genre")
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.HasMaxLength(50)
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.HasColumnType("TEXT");
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b.Property<long?>("MarketValue")
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.HasColumnType("INTEGER");
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b.Property<string>("MarketValueSource")
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.HasMaxLength(100)
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.HasColumnType("TEXT");
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b.Property<DateTimeOffset?>("MarketValueUpdatedAt")
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.HasColumnType("TEXT");
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b.Property<string>("Notes")
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.HasColumnType("TEXT");
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b.Property<bool>("Own")
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.HasColumnType("INTEGER");
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b.Property<string>("OwnerId")
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.IsRequired()
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.HasColumnType("TEXT");
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b.Property<bool>("Played")
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.HasColumnType("INTEGER");
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b.Property<string>("Publisher")
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.HasMaxLength(100)
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.HasColumnType("TEXT");
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b.Property<DateOnly?>("PurchaseDate")
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.HasColumnType("TEXT");
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b.Property<long?>("PurchasePrice")
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.HasColumnType("INTEGER");
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b.Property<int?>("Rating")
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.HasColumnType("INTEGER");
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b.Property<int>("Region")
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.HasColumnType("INTEGER");
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b.Property<string>("System")
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.HasMaxLength(50)
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.HasColumnType("TEXT");
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b.Property<string>("Title")
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.IsRequired()
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.HasMaxLength(200)
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.HasColumnType("TEXT");
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b.Property<DateTimeOffset>("UpdatedAt")
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.HasColumnType("TEXT");
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b.Property<long?>("ValueCib")
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.HasColumnType("INTEGER");
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b.Property<long?>("ValueLoose")
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.HasColumnType("INTEGER");
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b.Property<long?>("ValueNew")
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.HasColumnType("INTEGER");
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b.Property<string>("Year")
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.HasMaxLength(50)
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.HasColumnType("TEXT");
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b.HasKey("Id");
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b.HasIndex("OwnerId", "Genre");
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b.HasIndex("OwnerId", "Rating");
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b.HasIndex("OwnerId", "System");
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b.HasIndex("OwnerId", "Title");
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b.ToTable("Games");
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRole", b =>
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{
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b.Property<string>("Id")
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.HasColumnType("TEXT");
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b.Property<string>("ConcurrencyStamp")
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.IsConcurrencyToken()
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.HasColumnType("TEXT");
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b.Property<string>("Name")
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.HasMaxLength(256)
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.HasColumnType("TEXT");
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b.Property<string>("NormalizedName")
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.HasMaxLength(256)
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.HasColumnType("TEXT");
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b.HasKey("Id");
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b.HasIndex("NormalizedName")
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.IsUnique()
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.HasDatabaseName("RoleNameIndex");
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b.ToTable("AspNetRoles", (string)null);
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRoleClaim<string>", b =>
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{
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b.Property<int>("Id")
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.ValueGeneratedOnAdd()
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.HasColumnType("INTEGER");
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b.Property<string>("ClaimType")
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.HasColumnType("TEXT");
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b.Property<string>("ClaimValue")
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.HasColumnType("TEXT");
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b.Property<string>("RoleId")
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.IsRequired()
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.HasColumnType("TEXT");
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b.HasKey("Id");
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b.HasIndex("RoleId");
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b.ToTable("AspNetRoleClaims", (string)null);
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserClaim<string>", b =>
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{
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b.Property<int>("Id")
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.ValueGeneratedOnAdd()
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.HasColumnType("INTEGER");
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b.Property<string>("ClaimType")
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.HasColumnType("TEXT");
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b.Property<string>("ClaimValue")
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.HasColumnType("TEXT");
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b.Property<string>("UserId")
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.IsRequired()
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.HasColumnType("TEXT");
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b.HasKey("Id");
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b.HasIndex("UserId");
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b.ToTable("AspNetUserClaims", (string)null);
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserLogin<string>", b =>
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{
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b.Property<string>("LoginProvider")
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.HasColumnType("TEXT");
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b.Property<string>("ProviderKey")
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.HasColumnType("TEXT");
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b.Property<string>("ProviderDisplayName")
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.HasColumnType("TEXT");
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b.Property<string>("UserId")
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.IsRequired()
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.HasColumnType("TEXT");
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b.HasKey("LoginProvider", "ProviderKey");
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b.HasIndex("UserId");
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b.ToTable("AspNetUserLogins", (string)null);
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserRole<string>", b =>
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{
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b.Property<string>("UserId")
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.HasColumnType("TEXT");
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b.Property<string>("RoleId")
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.HasColumnType("TEXT");
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b.HasKey("UserId", "RoleId");
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b.HasIndex("RoleId");
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b.ToTable("AspNetUserRoles", (string)null);
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserToken<string>", b =>
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{
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b.Property<string>("UserId")
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.HasColumnType("TEXT");
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b.Property<string>("LoginProvider")
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.HasColumnType("TEXT");
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b.Property<string>("Name")
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.HasColumnType("TEXT");
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b.Property<string>("Value")
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.HasColumnType("TEXT");
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b.HasKey("UserId", "LoginProvider", "Name");
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b.ToTable("AspNetUserTokens", (string)null);
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});
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modelBuilder.Entity("LudosData.Api.Domain.Game", b =>
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{
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b.HasOne("LudosData.Api.Domain.AppUser", "Owner")
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.WithMany("Games")
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.HasForeignKey("OwnerId")
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.OnDelete(DeleteBehavior.Cascade)
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.IsRequired();
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b.Navigation("Owner");
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRoleClaim<string>", b =>
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{
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b.HasOne("Microsoft.AspNetCore.Identity.IdentityRole", null)
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.WithMany()
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.HasForeignKey("RoleId")
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.OnDelete(DeleteBehavior.Cascade)
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.IsRequired();
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserClaim<string>", b =>
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{
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b.HasOne("LudosData.Api.Domain.AppUser", null)
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.WithMany()
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.HasForeignKey("UserId")
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.OnDelete(DeleteBehavior.Cascade)
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.IsRequired();
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserLogin<string>", b =>
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{
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b.HasOne("LudosData.Api.Domain.AppUser", null)
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.WithMany()
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.HasForeignKey("UserId")
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.OnDelete(DeleteBehavior.Cascade)
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.IsRequired();
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserRole<string>", b =>
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{
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b.HasOne("Microsoft.AspNetCore.Identity.IdentityRole", null)
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.WithMany()
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.HasForeignKey("RoleId")
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.OnDelete(DeleteBehavior.Cascade)
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.IsRequired();
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b.HasOne("LudosData.Api.Domain.AppUser", null)
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.WithMany()
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.HasForeignKey("UserId")
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.OnDelete(DeleteBehavior.Cascade)
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.IsRequired();
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});
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modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserToken<string>", b =>
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{
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b.HasOne("LudosData.Api.Domain.AppUser", null)
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.WithMany()
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.HasForeignKey("UserId")
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.OnDelete(DeleteBehavior.Cascade)
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.IsRequired();
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});
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modelBuilder.Entity("LudosData.Api.Domain.AppUser", b =>
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{
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b.Navigation("Games");
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});
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#pragma warning restore 612, 618
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}
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}
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}
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@@ -0,0 +1,48 @@
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using Microsoft.EntityFrameworkCore.Migrations;
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#nullable disable
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namespace LudosData.Api.Data.Migrations
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{
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/// <inheritdoc />
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public partial class AddTieredPrices : Migration
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{
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/// <inheritdoc />
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protected override void Up(MigrationBuilder migrationBuilder)
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{
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migrationBuilder.AddColumn<long>(
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name: "ValueCib",
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table: "Games",
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type: "INTEGER",
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nullable: true);
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migrationBuilder.AddColumn<long>(
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name: "ValueLoose",
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table: "Games",
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type: "INTEGER",
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nullable: true);
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migrationBuilder.AddColumn<long>(
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name: "ValueNew",
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table: "Games",
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type: "INTEGER",
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nullable: true);
|
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}
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|
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/// <inheritdoc />
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protected override void Down(MigrationBuilder migrationBuilder)
|
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{
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migrationBuilder.DropColumn(
|
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name: "ValueCib",
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table: "Games");
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migrationBuilder.DropColumn(
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name: "ValueLoose",
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table: "Games");
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migrationBuilder.DropColumn(
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name: "ValueNew",
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table: "Games");
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}
|
||||
}
|
||||
}
|
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@@ -177,6 +177,15 @@ namespace LudosData.Api.Data.Migrations
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b.Property<DateTimeOffset>("UpdatedAt")
|
||||
.HasColumnType("TEXT");
|
||||
|
||||
b.Property<long?>("ValueCib")
|
||||
.HasColumnType("INTEGER");
|
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|
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b.Property<long?>("ValueLoose")
|
||||
.HasColumnType("INTEGER");
|
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|
||||
b.Property<long?>("ValueNew")
|
||||
.HasColumnType("INTEGER");
|
||||
|
||||
b.Property<string>("Year")
|
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.HasMaxLength(50)
|
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.HasColumnType("TEXT");
|
||||
|
||||
Reference in New Issue
Block a user