Add named project snapshots

src/db/schema/project-snapshots.ts

@@ -0,0 +1,36 @@
+import {
+  index,
+  integer,
+  sqliteTable,
+  text,
+  unique,
+} from "drizzle-orm/sqlite-core";
+import { projects } from "./projects.js";
+
+export const projectSnapshots = sqliteTable(
+  "project_snapshots",
+  {
+    id: text("id").primaryKey(),
+    projectId: text("project_id")
+      .notNull()
+      .references(() => projects.id, { onDelete: "cascade" }),
+    sourceRevision: integer("source_revision").notNull(),
+    schemaVersion: integer("schema_version").notNull(),
+    name: text("name").notNull(),
+    description: text("description"),
+    payloadJson: text("payload_json").notNull(),
+    payloadSha256: text("payload_sha256").notNull(),
+    createdAtIso: text("created_at_iso").notNull(),
+    createdByActorId: text("created_by_actor_id"),
+  },
+  (table) => [
+    unique("project_snapshots_project_name_unique").on(
+      table.projectId,
+      table.name
+    ),
+    index("project_snapshots_project_created_idx").on(
+      table.projectId,
+      table.createdAtIso
+    ),
+  ]
+);