[claude] Context injection — pass conversation history to work model (#39) (#78)

lib/db/src/schema/index.ts

@@ -13,3 +13,4 @@ export * from "./nostr-trust-vouches";
 export * from "./relay-accounts";
 export * from "./relay-event-queue";
 export * from "./job-debates";
+export * from "./session-messages";

lib/db/src/schema/session-messages.ts

@@ -0,0 +1,18 @@
+import { pgTable, text, timestamp, integer, serial } from "drizzle-orm/pg-core";
+import { sessions } from "./sessions";
+
+// ── session_messages ────────────────────────────────────────────────────────
+// Stores conversation history for context injection into the work model.
+
+export const sessionMessages = pgTable("session_messages", {
+  id: serial("id").primaryKey(),
+  sessionId: text("session_id")
+    .notNull()
+    .references(() => sessions.id),
+  role: text("role").$type<"user" | "assistant">().notNull(),
+  content: text("content").notNull(),
+  tokenCount: integer("token_count"),
+  createdAt: timestamp("created_at", { withTimezone: true }).defaultNow().notNull(),
+});
+
+export type SessionMessage = typeof sessionMessages.$inferSelect;