diff --git a/lib/db/schema/gamePlatformSupport.ts b/lib/db/schema/gamePlatformSupport.ts
new file mode 100644
index 0000000..a024350
--- /dev/null
+++ b/lib/db/schema/gamePlatformSupport.ts
@@ -0,0 +1,61 @@
+import {
+  boolean,
+  pgEnum,
+  pgTable,
+  text,
+  timestamp,
+  unique,
+} from "drizzle-orm/pg-core"
+import { games } from "./games"
+import { hardware } from "./hardware"
+
+export const protonStatusEnum = pgEnum("proton_status", [
+  "native",
+  "proton",
+  "unsupported",
+  "unknown",
+])
+
+export const antiCheatStatusEnum = pgEnum("anti_cheat_status", [
+  "none",
+  "supported",
+  "unsupported",
+  "unknown",
+])
+
+export const gamePlatformSupport = pgTable(
+  "game_platform_support",
+  {
+    id: text("id")
+      .primaryKey()
+      .$defaultFn(() => crypto.randomUUID()),
+    gameId: text("game_id")
+      .notNull()
+      .references(() => games.id, { onDelete: "cascade" }),
+    hardwareSlug: text("hardware_slug")
+      .notNull()
+      .references(() => hardware.slug, { onDelete: "restrict" }),
+
+    // Compatibility
+    isSupported: boolean("is_supported").default(false).notNull(),
+    protonStatus: protonStatusEnum("proton_status")
+      .default("unknown")
+      .notNull(),
+
+    // Anti-cheat details
+    antiCheatRelevant: boolean("anti_cheat_relevant")
+      .default(false)
+      .notNull(),
+    antiCheatName: text("anti_cheat_name"),
+    antiCheatVersion: text("anti_cheat_version"),
+    antiCheatStatus: antiCheatStatusEnum("anti_cheat_status")
+      .default("unknown")
+      .notNull(),
+
+    createdAt: timestamp("created_at").defaultNow().notNull(),
+    updatedAt: timestamp("updated_at").defaultNow().notNull(),
+  },
+  (table) => [
+    unique("game_hardware_unique").on(table.gameId, table.hardwareSlug),
+  ]
+)
diff --git a/lib/db/schema/index.ts b/lib/db/schema/index.ts
index 3222d42..2d99c03 100644
--- a/lib/db/schema/index.ts
+++ b/lib/db/schema/index.ts
@@ -2,6 +2,5 @@
 export * from "./games"
 export * from "./gameVersions"
 export * from "./hardware"
-// TODO: uncomment when files are created in Chunk 3
-// export * from "./performanceEntries"
-// export * from "./gamePlatformSupport"
+export * from "./performanceEntries"
+export * from "./gamePlatformSupport"
diff --git a/lib/db/schema/performanceEntries.ts b/lib/db/schema/performanceEntries.ts
new file mode 100644
index 0000000..7bd4154
--- /dev/null
+++ b/lib/db/schema/performanceEntries.ts
@@ -0,0 +1,51 @@
+import {
+  boolean,
+  jsonb,
+  pgTable,
+  real,
+  text,
+  timestamp,
+} from "drizzle-orm/pg-core"
+import { gameVersions } from "./gameVersions"
+import { hardware } from "./hardware"
+
+export const performanceEntries = pgTable("performance_entries", {
+  id: text("id")
+    .primaryKey()
+    .$defaultFn(() => crypto.randomUUID()),
+  versionId: text("version_id")
+    .notNull()
+    .references(() => gameVersions.id, { onDelete: "cascade" }),
+  hardwareSlug: text("hardware_slug")
+    .notNull()
+    .references(() => hardware.slug, { onDelete: "restrict" }),
+  userId: text("user_id").notNull(),
+
+  // Performance metrics
+  fpsAvg: real("fps_avg").notNull(),
+  fpsLow: real("fps_low"),
+  fpsHigh: real("fps_high"),
+
+  // Environment
+  protonVersion: text("proton_version"),
+  osVersion: text("os_version"),
+
+  // Feature flags
+  isFsrEnabled: boolean("is_fsr_enabled").default(false).notNull(),
+  isFrameGenEnabled: boolean("is_frame_gen_enabled").default(false).notNull(),
+
+  // Load times (seconds)
+  loadTimeSsd: real("load_time_ssd"),
+  loadTimeSd: real("load_time_sd"),
+
+  // Settings & notes
+  settingsJson: jsonb("settings_json").$type<Record<string, unknown>>(),
+  userNotes: text("user_notes"),
+
+  // Moderation
+  isRemoved: boolean("is_removed").default(false).notNull(),
+  removedReason: text("removed_reason"),
+
+  createdAt: timestamp("created_at").defaultNow().notNull(),
+  updatedAt: timestamp("updated_at").defaultNow().notNull(),
+})