establish db

apps/web/src/lib/db/index.ts

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+/**
+ * Drizzle ORM Database Client for Turso/libSQL.
+ *
+ * Provides the configured drizzle instance and convenience helpers.
+ * Reads DATABASE_URL and DATABASE_TOKEN from environment.
+ */
+
+import { sql } from "drizzle-orm";
+import { drizzle, type LibSQLDatabase } from "drizzle-orm/libsql";
+import { createClient } from "@libsql/client";
+import * as schema from "./schema";
+
+export type { PlantRow, PlantInsert, DiseaseRow, DiseaseInsert } from "./schema";
+
+export { schema };
+
+let _db: LibSQLDatabase<typeof schema> | null = null;
+let _client: ReturnType<typeof createClient> | null = null;
+
+/** Get or create the Drizzle database instance (singleton). */
+export function getDb(): LibSQLDatabase<typeof schema> {
+  if (_db) return _db;
+
+  const url = process.env.DATABASE_URL;
+  const token = process.env.DATABASE_TOKEN;
+
+  if (!url) {
+    throw new Error(
+      "DATABASE_URL is not set. Check your .env.development or .env.production file.",
+    );
+  }
+  if (!token) {
+    throw new Error(
+      "DATABASE_TOKEN is not set. Check your .env.development or .env.production file.",
+    );
+  }
+
+  _client = createClient({ url, authToken: token });
+  _db = drizzle(_client, { schema });
+  return _db;
+}
+
+/** Check database connectivity. */
+export async function checkConnection(): Promise<boolean> {
+  try {
+    const db = getDb();
+    const result = await db.run(sql`SELECT 1 AS ok`);
+    return result.rowsAffected >= 0;
+  } catch (err) {
+    console.error("[DB] Connection failed:", err);
+    return false;
+  }
+}
+
+/** Close the client connection. */
+export function closeDb() {
+  if (_client) {
+    _client.close();
+    _client = null;
+    _db = null;
+  }
+}

apps/web/src/lib/db/schema.ts

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+/**
+ * Drizzle ORM Schema for the Plant Disease Knowledge Base.
+ *
+ * Uses Turso (libSQL) with SQLite dialect.
+ * Arrays (symptoms, causes, treatment, prevention, lookalike_ids)
+ * are stored as JSON text columns and typed via Drizzle's $type().
+ */
+
+import { sql } from "drizzle-orm";
+import { sqliteTable, text, integer, index } from "drizzle-orm/sqlite-core";
+
+// ─── Plants Table ────────────────────────────────────────────────────────────
+
+export const plants = sqliteTable(
+  "plants",
+  {
+    id: text("id").primaryKey(),
+    commonName: text("common_name").notNull(),
+    scientificName: text("scientific_name").notNull(),
+    family: text("family").notNull(),
+    category: text("category").notNull(),
+    careSummary: text("care_summary").notNull().default(""),
+    imageUrl: text("image_url").notNull().default(""),
+    createdAt: text("created_at")
+      .notNull()
+      .default(sql`(datetime('now'))`),
+    updatedAt: text("updated_at")
+      .notNull()
+      .default(sql`(datetime('now'))`),
+  },
+  (table) => ({
+    categoryIdx: index("idx_plants_category").on(table.category),
+    commonNameIdx: index("idx_plants_common_name").on(table.commonName),
+  }),
+);
+
+// ─── Diseases Table ──────────────────────────────────────────────────────────
+
+export const diseases = sqliteTable(
+  "diseases",
+  {
+    id: text("id").primaryKey(),
+    plantId: text("plant_id")
+      .notNull()
+      .references(() => plants.id),
+    name: text("name").notNull(),
+    scientificName: text("scientific_name").notNull().default(""),
+    causalAgentType: text("causal_agent_type", {
+      enum: ["fungal", "bacterial", "viral", "environmental"],
+    }).notNull(),
+    description: text("description").notNull().default(""),
+    symptoms: text("symptoms", { mode: "json" }).notNull().default([]).$type<string[]>(),
+    causes: text("causes", { mode: "json" }).notNull().default([]).$type<string[]>(),
+    treatment: text("treatment", { mode: "json" }).notNull().default([]).$type<string[]>(),
+    prevention: text("prevention", { mode: "json" }).notNull().default([]).$type<string[]>(),
+    lookalikeIds: text("lookalike_ids", { mode: "json" }).notNull().default([]).$type<string[]>(),
+    severity: text("severity", {
+      enum: ["low", "moderate", "high", "critical"],
+    }).notNull(),
+    sourceUrl: text("source_url").notNull().default(""),
+    createdAt: text("created_at")
+      .notNull()
+      .default(sql`(datetime('now'))`),
+    updatedAt: text("updated_at")
+      .notNull()
+      .default(sql`(datetime('now'))`),
+  },
+  (table) => ({
+    plantIdIdx: index("idx_diseases_plant_id").on(table.plantId),
+    causalAgentIdx: index("idx_diseases_causal_agent").on(table.causalAgentType),
+    severityIdx: index("idx_diseases_severity").on(table.severity),
+  }),
+);
+
+// ─── Scrape Sources Table ────────────────────────────────────────────────────
+
+export const scrapeSources = sqliteTable("scrape_sources", {
+  id: text("id").primaryKey(),
+  sourceType: text("source_type", {
+    enum: ["wikipedia", "university_extension", "cabi", "other"],
+  }).notNull(),
+  sourceUrl: text("source_url").notNull(),
+  lastScrapedAt: text("last_scraped_at"),
+  entriesCount: integer("entries_count").default(0),
+  status: text("status", { enum: ["pending", "success", "error"] })
+    .notNull()
+    .default("pending"),
+  errorMessage: text("error_message"),
+  createdAt: text("created_at")
+    .notNull()
+    .default(sql`(datetime('now'))`),
+});
+
+// ─── Relation Inference ──────────────────────────────────────────────────────
+
+export const plantsRelations = {};
+export const diseasesRelations = {};
+
+// ─── Type helpers ────────────────────────────────────────────────────────────
+
+export type PlantRow = typeof plants.$inferSelect;
+export type PlantInsert = typeof plants.$inferInsert;
+export type DiseaseRow = typeof diseases.$inferSelect;
+export type DiseaseInsert = typeof diseases.$inferInsert;