feat(cards-server): Phase α — service skeleton + 16-table schema

Lays the foundation for the Cards marketplace + community backend per
apps/cards/docs/MARKETPLACE_PLAN.md. Phase α scope: skeleton, schema,
JWT auth wiring, health endpoint. Routes follow in Phase β.

Stack: Hono + Bun + Drizzle + Postgres + jose-JWKS — mirrors the
mana-credits service template.

Schema: pgSchema('cards') inside mana_platform, 16 tables across six
groups in src/db/schema/:
  - authors.ts: authors, author_follows
  - decks.ts: decks, deck_versions, deck_cards (with cards_card_type
    enum mirroring @mana/cards-core; per-card content_hash for
    smart-merge; CHECK constraint that paid decks must use
    Cards-Pro-Only-1.0 license)
  - tags.ts: tag_definitions (hierarchical), deck_tags
  - engagement.ts: deck_stars, deck_subscriptions, deck_forks
  - discussions.ts: deck_pull_requests (with diff jsonb +
    pr_status enum), card_discussions (bound to card_content_hash
    so threads survive version bumps)
  - moderation.ts: deck_reports (with category/status enums),
    ai_moderation_log
  - credits.ts: deck_purchases (snapshot price + author/mana split),
    author_payouts

Phase λ's co_learn_sessions intentionally not yet here.

Service plumbing:
  - src/index.ts: Hono entry on :3072, /health unauth, /v1 stub
  - src/config.ts: env loader with author-payout BPS knobs
    (defaults 80/20 standard, 90/10 verified-mana) and
    community-verified thresholds
  - src/middleware/jwt-auth.ts + service-auth.ts: JWKS validation
    + X-Service-Key check (mirrors mana-credits)
  - src/lib/errors.ts: HttpError + named subclasses
  - drizzle.config.ts pointing at mana_platform with schemaFilter:cards
  - drizzle/0000_*.sql committed so other devs / prod migration path
    has a reproducible starting point

Validated: tsc --noEmit clean, drizzle-kit generate produces
233-line SQL with all 16 tables + 5 enums + indexes.

Next (Phase α.4): Dockerfile + docker-compose + cloudflare tunnel
route cards-api.mana.how → :3072.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

services/cards-server/src/db/connection.ts

@@ -0,0 +1,23 @@
+import { drizzle } from 'drizzle-orm/postgres-js';
+import postgres from 'postgres';
+import * as schema from './schema';
+
+let _db: ReturnType<typeof drizzle<typeof schema>> | null = null;
+
+/**
+ * Lazy singleton — caller passes the url, but reuses the pool across
+ * the lifetime of the process. drizzle-kit cli skips this and opens
+ * its own connection from drizzle.config.ts.
+ */
+export function getDb(url: string) {
+	if (_db) return _db;
+	const client = postgres(url, {
+		max: 10,
+		idle_timeout: 20,
+		connect_timeout: 10,
+	});
+	_db = drizzle(client, { schema });
+	return _db;
+}
+
+export type Database = ReturnType<typeof getDb>;

services/cards-server/src/db/schema/_schema.ts

@@ -0,0 +1,10 @@
+import { pgSchema } from 'drizzle-orm/pg-core';
+
+/**
+ * All Cards-marketplace tables live under the `cards` Postgres schema
+ * inside `mana_platform`. This keeps the marketplace next to the rest
+ * of the per-app data (Mana convention: one schema per product) and
+ * lets the per-table FKs reference shared tables (e.g. `auth.users`)
+ * via plain text columns without cross-DB JOINs.
+ */
+export const cardsSchema = pgSchema('cards');

services/cards-server/src/db/schema/authors.ts

@@ -0,0 +1,66 @@
+/**
+ * Authors — public-facing identity layer for users who publish decks.
+ *
+ * One author row per user that has ever opted into being an author.
+ * `userId` is a plain text reference to `auth.users.id` (cross-DB,
+ * no FK at the DB level — the consumer service validates JWTs from
+ * mana-auth and uses the `sub` claim verbatim).
+ *
+ * Verification has two orthogonal axes:
+ *   - `verified_mana`: manually granted by Mana-Verein (teachers,
+ *     professional educators, doctors, etc.). Not earnable.
+ *   - `verified_community`: automatically calculated from engagement
+ *     (≥ X stars across decks, ≥ Y featured decks, ≥ Z subscribers).
+ *     Periodically re-evaluated.
+ *
+ * Both axes can be true at once → the UI shows both badges.
+ */
+
+import { boolean, index, text, timestamp, uniqueIndex } from 'drizzle-orm/pg-core';
+import { cardsSchema } from './_schema';
+
+export const authors = cardsSchema.table(
+	'authors',
+	{
+		userId: text('user_id').primaryKey(),
+		slug: text('slug').notNull(),
+		displayName: text('display_name').notNull(),
+		bio: text('bio'),
+		avatarUrl: text('avatar_url'),
+		joinedAt: timestamp('joined_at', { withTimezone: true }).defaultNow().notNull(),
+		// Pseudonym mode: legal name stays hidden, only displayName visible.
+		pseudonym: boolean('pseudonym').default(false).notNull(),
+		// Verification flags (see header).
+		verifiedMana: boolean('verified_mana').default(false).notNull(),
+		verifiedCommunity: boolean('verified_community').default(false).notNull(),
+		// Soft-ban: blocked author can no longer publish, existing decks
+		// stay readable but get a "deactivated" badge.
+		bannedAt: timestamp('banned_at', { withTimezone: true }),
+		bannedReason: text('banned_reason'),
+	},
+	(t) => ({
+		slugIdx: uniqueIndex('authors_slug_idx').on(t.slug),
+		verifiedIdx: index('authors_verified_idx').on(t.verifiedMana, t.verifiedCommunity),
+	})
+);
+
+/**
+ * Following relationship between users (followers) and authors.
+ * Drives the personal activity feed.
+ */
+export const authorFollows = cardsSchema.table(
+	'author_follows',
+	{
+		followerUserId: text('follower_user_id').notNull(),
+		authorUserId: text('author_user_id')
+			.notNull()
+			.references(() => authors.userId, { onDelete: 'cascade' }),
+		since: timestamp('since', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(t) => ({
+		// Composite primary key (user, author).
+		pk: uniqueIndex('author_follows_pk').on(t.followerUserId, t.authorUserId),
+		authorIdx: index('author_follows_author_idx').on(t.authorUserId),
+		followerIdx: index('author_follows_follower_idx').on(t.followerUserId),
+	})
+);

services/cards-server/src/db/schema/credits.ts

@@ -0,0 +1,63 @@
+/**
+ * Two-sided marketplace bookkeeping. The actual money lives in
+ * mana-credits — we just record the deck-purchase event and the
+ * derived author payout so we can show buyer history, author
+ * dashboards, and reconcile against the mana-credits ledger.
+ */
+
+import { index, integer, text, timestamp, uniqueIndex, uuid } from 'drizzle-orm/pg-core';
+import { cardsSchema } from './_schema';
+import { authors } from './authors';
+import { publicDecks, publicDeckVersions } from './decks';
+
+export const deckPurchases = cardsSchema.table(
+	'deck_purchases',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		buyerUserId: text('buyer_user_id').notNull(),
+		deckId: uuid('deck_id')
+			.notNull()
+			.references(() => publicDecks.id, { onDelete: 'restrict' }),
+		// Snapshot the version at time of purchase — buyer keeps lifetime
+		// access to all subsequent versions.
+		versionId: uuid('version_id')
+			.notNull()
+			.references(() => publicDeckVersions.id, { onDelete: 'restrict' }),
+		// Snapshot of the price at the time of purchase.
+		priceCredits: integer('price_credits').notNull(),
+		// Pre-computed split (sum equals priceCredits modulo rounding).
+		authorShare: integer('author_share').notNull(),
+		manaShare: integer('mana_share').notNull(),
+		// Reference into mana-credits ledger.
+		creditsTransaction: text('credits_transaction'),
+		purchasedAt: timestamp('purchased_at', { withTimezone: true }).defaultNow().notNull(),
+		refundedAt: timestamp('refunded_at', { withTimezone: true }),
+	},
+	(t) => ({
+		// One purchase per buyer per deck — covers lifetime access.
+		uniqueBuyerDeck: uniqueIndex('deck_purchases_buyer_deck_idx').on(t.buyerUserId, t.deckId),
+		buyerIdx: index('deck_purchases_buyer_idx').on(t.buyerUserId),
+		deckIdx: index('deck_purchases_deck_idx').on(t.deckId),
+	})
+);
+
+export const authorPayouts = cardsSchema.table(
+	'author_payouts',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		authorUserId: text('author_user_id')
+			.notNull()
+			.references(() => authors.userId, { onDelete: 'restrict' }),
+		sourcePurchaseId: uuid('source_purchase_id')
+			.notNull()
+			.references(() => deckPurchases.id, { onDelete: 'restrict' }),
+		creditsGranted: integer('credits_granted').notNull(),
+		// Reference into mana-credits grant ledger.
+		creditsGrantId: text('credits_grant_id'),
+		grantedAt: timestamp('granted_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(t) => ({
+		authorIdx: index('author_payouts_author_idx').on(t.authorUserId),
+		purchaseIdx: index('author_payouts_purchase_idx').on(t.sourcePurchaseId),
+	})
+);

services/cards-server/src/db/schema/decks.ts

@@ -0,0 +1,126 @@
+/**
+ * Decks, Versions, Cards.
+ *
+ * A deck is the long-lived thing the user identifies with ("Spanish
+ * A2 Vocab"). It always points at a `latest_version_id`. Versions are
+ * immutable snapshots — once published, they never change. Cards are
+ * scoped to a version and carry a per-card content-hash so subscriber
+ * smart-merge can preserve FSRS state for unchanged cards across
+ * version bumps.
+ *
+ * `price_credits` of 0 means free. Anything > 0 forces the
+ * Cards-Pro-Only-1.0 license (CHECK constraint enforced at DB level).
+ */
+
+import {
+	boolean,
+	check,
+	index,
+	integer,
+	jsonb,
+	pgEnum,
+	text,
+	timestamp,
+	uniqueIndex,
+	uuid,
+} from 'drizzle-orm/pg-core';
+import { sql } from 'drizzle-orm';
+import { cardsSchema } from './_schema';
+import { authors } from './authors';
+
+/** Mirrors `CardType` in @mana/cards-core. Phase-1 ships basic / basic-reverse / cloze / type-in. */
+export const cardTypeEnum = pgEnum('cards_card_type', [
+	'basic',
+	'basic-reverse',
+	'cloze',
+	'type-in',
+	'image-occlusion',
+	'audio',
+	'multiple-choice',
+]);
+
+export const publicDecks = cardsSchema.table(
+	'decks',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		slug: text('slug').notNull(),
+		title: text('title').notNull(),
+		description: text('description'),
+		// ISO-639-1 (e.g. 'de', 'en', 'es'). Nullable for mixed-language decks.
+		language: text('language'),
+		// SPDX-style ID. CC0-1.0, CC-BY-4.0, CC-BY-SA-4.0,
+		// Cards-Personal-Use-1.0 (default for free), Cards-Pro-Only-1.0 (paid).
+		license: text('license').notNull().default('Cards-Personal-Use-1.0'),
+		priceCredits: integer('price_credits').notNull().default(0),
+		ownerUserId: text('owner_user_id')
+			.notNull()
+			.references(() => authors.userId, { onDelete: 'restrict' }),
+		// Updated each time a new version is published.
+		latestVersionId: uuid('latest_version_id'),
+		isFeatured: boolean('is_featured').notNull().default(false),
+		isTakedown: boolean('is_takedown').notNull().default(false),
+		takedownAt: timestamp('takedown_at', { withTimezone: true }),
+		takedownReason: text('takedown_reason'),
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(t) => ({
+		slugIdx: uniqueIndex('decks_slug_idx').on(t.slug),
+		ownerIdx: index('decks_owner_idx').on(t.ownerUserId),
+		featuredIdx: index('decks_featured_idx').on(t.isFeatured),
+		// Paid decks must carry the Pro-Only license.
+		priceLicense: check(
+			'decks_price_requires_license',
+			sql`price_credits = 0 OR license = 'Cards-Pro-Only-1.0'`
+		),
+	})
+);
+
+export const publicDeckVersions = cardsSchema.table(
+	'deck_versions',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		deckId: uuid('deck_id')
+			.notNull()
+			.references(() => publicDecks.id, { onDelete: 'cascade' }),
+		// SemVer string — ordering done in app code, not DB.
+		semver: text('semver').notNull(),
+		changelog: text('changelog'),
+		// SHA-256 over the canonicalized card list — clients use this to
+		// detect "did anything change" without diffing payloads.
+		contentHash: text('content_hash').notNull(),
+		cardCount: integer('card_count').notNull(),
+		publishedAt: timestamp('published_at', { withTimezone: true }).defaultNow().notNull(),
+		// Older versions stay readable but new subscribers go to latest.
+		deprecatedAt: timestamp('deprecated_at', { withTimezone: true }),
+	},
+	(t) => ({
+		uniqueSemver: uniqueIndex('deck_versions_deck_semver_idx').on(t.deckId, t.semver),
+		deckIdx: index('deck_versions_deck_idx').on(t.deckId),
+		hashIdx: index('deck_versions_hash_idx').on(t.contentHash),
+	})
+);
+
+export const publicDeckCards = cardsSchema.table(
+	'deck_cards',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		versionId: uuid('version_id')
+			.notNull()
+			.references(() => publicDeckVersions.id, { onDelete: 'cascade' }),
+		// Mirrors @mana/cards-core CardType.
+		type: cardTypeEnum('type').notNull(),
+		// Free-form key/value bag of user content.
+		// basic / basic-reverse / type-in: { front, back }
+		// cloze: { text, extra? }
+		fields: jsonb('fields').$type<Record<string, string>>().notNull(),
+		ord: integer('ord').notNull(),
+		// SHA-256 over canonical(type, fields). Subscribers use this to
+		// detect per-card changes during smart-merge — unchanged cards
+		// keep their FSRS state across version pulls.
+		contentHash: text('content_hash').notNull(),
+	},
+	(t) => ({
+		uniqueOrd: uniqueIndex('deck_cards_version_ord_idx').on(t.versionId, t.ord),
+		hashIdx: index('deck_cards_hash_idx').on(t.contentHash),
+	})
+);

services/cards-server/src/db/schema/discussions.ts

@@ -0,0 +1,79 @@
+/**
+ * Pull-Requests + Card-Discussions.
+ *
+ * Pull-requests propose card-level changes to a deck; the author can
+ * merge → cards-server creates a new version automatically. The diff
+ * is stored as a JSON blob ({ add, modify, remove }) so we can render
+ * a GitHub-style review UI without re-deriving from version diffs.
+ *
+ * Card discussions are bound to `card_content_hash` (not `card_id`)
+ * so threads survive version bumps as long as the card itself stays
+ * unchanged.
+ */
+
+import { index, jsonb, text, timestamp, uuid, boolean, pgEnum } from 'drizzle-orm/pg-core';
+import { cardsSchema } from './_schema';
+import { publicDecks, publicDeckVersions } from './decks';
+
+export const pullRequestStatusEnum = pgEnum('cards_pr_status', [
+	'open',
+	'merged',
+	'closed',
+	'rejected',
+]);
+
+export interface PullRequestDiff {
+	add: { type: string; fields: Record<string, string> }[];
+	modify: { contentHash: string; fields: Record<string, string> }[];
+	remove: { contentHash: string }[];
+}
+
+export const deckPullRequests = cardsSchema.table(
+	'deck_pull_requests',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		deckId: uuid('deck_id')
+			.notNull()
+			.references(() => publicDecks.id, { onDelete: 'cascade' }),
+		authorUserId: text('author_user_id').notNull(),
+		status: pullRequestStatusEnum('status').notNull().default('open'),
+		title: text('title').notNull(),
+		body: text('body'),
+		diff: jsonb('diff').$type<PullRequestDiff>().notNull(),
+		mergedIntoVersionId: uuid('merged_into_version_id').references(() => publicDeckVersions.id, {
+			onDelete: 'set null',
+		}),
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+		resolvedAt: timestamp('resolved_at', { withTimezone: true }),
+	},
+	(t) => ({
+		deckIdx: index('deck_pull_requests_deck_idx').on(t.deckId),
+		statusIdx: index('deck_pull_requests_status_idx').on(t.deckId, t.status),
+		authorIdx: index('deck_pull_requests_author_idx').on(t.authorUserId),
+	})
+);
+
+export const cardDiscussions = cardsSchema.table(
+	'card_discussions',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		// Bound to the card's content_hash, not its row id, so the thread
+		// follows the card across version bumps as long as content stays.
+		cardContentHash: text('card_content_hash').notNull(),
+		deckId: uuid('deck_id')
+			.notNull()
+			.references(() => publicDecks.id, { onDelete: 'cascade' }),
+		authorUserId: text('author_user_id').notNull(),
+		// Threading: parent_id NULL = root post, NOT NULL = reply.
+		parentId: uuid('parent_id'),
+		body: text('body').notNull(),
+		// Hidden by author or moderator. Not deleted — preserves audit trail.
+		hidden: boolean('hidden').notNull().default(false),
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(t) => ({
+		hashIdx: index('card_discussions_hash_idx').on(t.cardContentHash),
+		deckIdx: index('card_discussions_deck_idx').on(t.deckId),
+		parentIdx: index('card_discussions_parent_idx').on(t.parentId),
+	})
+);

services/cards-server/src/db/schema/engagement.ts

@@ -0,0 +1,66 @@
+/**
+ * Engagement primitives — Stars (bookmarks), Subscriptions (live
+ * updates), Forks (own copy with lineage).
+ *
+ * All keyed by `user_id` text — a plain reference to auth.users.id
+ * with no cross-DB FK.
+ */
+
+import { boolean, index, timestamp, uniqueIndex, uuid, text } from 'drizzle-orm/pg-core';
+import { cardsSchema } from './_schema';
+import { publicDecks, publicDeckVersions } from './decks';
+
+export const deckStars = cardsSchema.table(
+	'deck_stars',
+	{
+		userId: text('user_id').notNull(),
+		deckId: uuid('deck_id')
+			.notNull()
+			.references(() => publicDecks.id, { onDelete: 'cascade' }),
+		starredAt: timestamp('starred_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(t) => ({
+		pk: uniqueIndex('deck_stars_pk').on(t.userId, t.deckId),
+		deckIdx: index('deck_stars_deck_idx').on(t.deckId),
+	})
+);
+
+export const deckSubscriptions = cardsSchema.table(
+	'deck_subscriptions',
+	{
+		userId: text('user_id').notNull(),
+		deckId: uuid('deck_id')
+			.notNull()
+			.references(() => publicDecks.id, { onDelete: 'cascade' }),
+		// Latest version the user has pulled. Smart-merge compares this to
+		// the deck's `latest_version_id` to compute the diff.
+		currentVersionId: uuid('current_version_id').references(() => publicDeckVersions.id, {
+			onDelete: 'set null',
+		}),
+		subscribedAt: timestamp('subscribed_at', { withTimezone: true }).defaultNow().notNull(),
+		notifyUpdates: boolean('notify_updates').notNull().default(true),
+	},
+	(t) => ({
+		pk: uniqueIndex('deck_subscriptions_pk').on(t.userId, t.deckId),
+		deckIdx: index('deck_subscriptions_deck_idx').on(t.deckId),
+		userIdx: index('deck_subscriptions_user_idx').on(t.userId),
+	})
+);
+
+export const deckForks = cardsSchema.table(
+	'deck_forks',
+	{
+		userId: text('user_id').notNull(),
+		sourceDeckId: uuid('source_deck_id')
+			.notNull()
+			.references(() => publicDecks.id, { onDelete: 'cascade' }),
+		sourceVersionId: uuid('source_version_id')
+			.notNull()
+			.references(() => publicDeckVersions.id, { onDelete: 'cascade' }),
+		forkedAt: timestamp('forked_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(t) => ({
+		pk: uniqueIndex('deck_forks_pk').on(t.userId, t.sourceDeckId, t.sourceVersionId),
+		sourceIdx: index('deck_forks_source_idx').on(t.sourceDeckId),
+	})
+);

services/cards-server/src/db/schema/index.ts

@@ -0,0 +1,13 @@
+/**
+ * Re-exports for the entire cards-server schema. Keep imports flat —
+ * downstream code does `import { authors, publicDecks } from '../db/schema'`.
+ */
+
+export { cardsSchema } from './_schema';
+export * from './authors';
+export * from './decks';
+export * from './tags';
+export * from './engagement';
+export * from './discussions';
+export * from './moderation';
+export * from './credits';

services/cards-server/src/db/schema/moderation.ts

@@ -0,0 +1,74 @@
+/**
+ * Moderation — user-submitted reports + AI-first-pass log.
+ *
+ * Reports flow into a Mana-admin inbox; AI-mod-log is a record of every
+ * automated check we ran on a version so we can audit / re-train if a
+ * bad outcome shipped.
+ */
+
+import { boolean, index, pgEnum, text, timestamp, uuid } from 'drizzle-orm/pg-core';
+import { cardsSchema } from './_schema';
+import { publicDecks, publicDeckVersions } from './decks';
+
+export const reportCategoryEnum = pgEnum('cards_report_category', [
+	'spam',
+	'copyright',
+	'nsfw',
+	'misinformation',
+	'hate',
+	'other',
+]);
+
+export const reportStatusEnum = pgEnum('cards_report_status', ['open', 'dismissed', 'actioned']);
+
+export const deckReports = cardsSchema.table(
+	'deck_reports',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		deckId: uuid('deck_id')
+			.notNull()
+			.references(() => publicDecks.id, { onDelete: 'cascade' }),
+		versionId: uuid('version_id').references(() => publicDeckVersions.id, {
+			onDelete: 'set null',
+		}),
+		// Optional: report scoped to one specific card by content-hash.
+		cardContentHash: text('card_content_hash'),
+		reporterUserId: text('reporter_user_id').notNull(),
+		category: reportCategoryEnum('category').notNull(),
+		body: text('body'),
+		status: reportStatusEnum('status').notNull().default('open'),
+		resolvedBy: text('resolved_by'),
+		resolvedAt: timestamp('resolved_at', { withTimezone: true }),
+		resolutionNotes: text('resolution_notes'),
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(t) => ({
+		deckIdx: index('deck_reports_deck_idx').on(t.deckId),
+		statusIdx: index('deck_reports_status_idx').on(t.status),
+	})
+);
+
+export const aiModerationVerdictEnum = pgEnum('cards_ai_mod_verdict', ['pass', 'flag', 'block']);
+
+export const aiModerationLog = cardsSchema.table(
+	'ai_moderation_log',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		versionId: uuid('version_id')
+			.notNull()
+			.references(() => publicDeckVersions.id, { onDelete: 'cascade' }),
+		verdict: aiModerationVerdictEnum('verdict').notNull(),
+		// Categories the model flagged — array because one verdict can hit
+		// multiple categories (e.g. "spam" + "misinformation").
+		categories: text('categories').array(),
+		model: text('model'),
+		rationale: text('rationale'),
+		humanReviewed: boolean('human_reviewed').notNull().default(false),
+		humanOverrode: boolean('human_overrode').notNull().default(false),
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(t) => ({
+		versionIdx: index('ai_moderation_log_version_idx').on(t.versionId),
+		verdictIdx: index('ai_moderation_log_verdict_idx').on(t.verdict),
+	})
+);

services/cards-server/src/db/schema/tags.ts

@@ -0,0 +1,43 @@
+/**
+ * Tag taxonomy. Hierarchical (parent_id), curated by the Mana-Verein
+ * for the canonical tree (medizin > anatomie > kardiologie). Authors
+ * pick from existing tags and can suggest new ones via a moderated
+ * flow (`curated = false` → admin reviews before promoting).
+ */
+
+import { boolean, index, text, timestamp, uniqueIndex, uuid } from 'drizzle-orm/pg-core';
+import { cardsSchema } from './_schema';
+import { publicDecks } from './decks';
+
+export const tagDefinitions = cardsSchema.table(
+	'tag_definitions',
+	{
+		id: uuid('id').primaryKey().defaultRandom(),
+		slug: text('slug').notNull(),
+		name: text('name').notNull(),
+		parentId: uuid('parent_id'),
+		description: text('description'),
+		curated: boolean('curated').notNull().default(false),
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+	},
+	(t) => ({
+		slugIdx: uniqueIndex('tag_definitions_slug_idx').on(t.slug),
+		parentIdx: index('tag_definitions_parent_idx').on(t.parentId),
+	})
+);
+
+export const deckTags = cardsSchema.table(
+	'deck_tags',
+	{
+		deckId: uuid('deck_id')
+			.notNull()
+			.references(() => publicDecks.id, { onDelete: 'cascade' }),
+		tagId: uuid('tag_id')
+			.notNull()
+			.references(() => tagDefinitions.id, { onDelete: 'cascade' }),
+	},
+	(t) => ({
+		pk: uniqueIndex('deck_tags_pk').on(t.deckId, t.tagId),
+		tagIdx: index('deck_tags_tag_idx').on(t.tagId),
+	})
+);