feat(06-01): install packages + extend schema + generate migration

- installed signature_pad, @react-email/render, @react-email/components
- added signingTokens table (jti pk, documentId, expiresAt, usedAt)
- added auditEvents table with auditEventTypeEnum (6 event types)
- added signedFilePath, pdfHash, signedAt columns to documents table
- generated and applied migration 0005_signing_flow.sql

teressa-copeland-homes/drizzle/0005_signing_flow.sql

@@ -0,0 +1,24 @@
+CREATE TYPE "public"."audit_event_type" AS ENUM('document_prepared', 'email_sent', 'link_opened', 'document_viewed', 'signature_submitted', 'pdf_hash_computed');--> statement-breakpoint
+CREATE TABLE "audit_events" (
+	"id" text PRIMARY KEY NOT NULL,
+	"document_id" text NOT NULL,
+	"event_type" "audit_event_type" NOT NULL,
+	"ip_address" text,
+	"user_agent" text,
+	"metadata" jsonb,
+	"created_at" timestamp DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE "signing_tokens" (
+	"jti" text PRIMARY KEY NOT NULL,
+	"document_id" text NOT NULL,
+	"created_at" timestamp DEFAULT now() NOT NULL,
+	"expires_at" timestamp NOT NULL,
+	"used_at" timestamp
+);
+--> statement-breakpoint
+ALTER TABLE "documents" ADD COLUMN "signed_file_path" text;--> statement-breakpoint
+ALTER TABLE "documents" ADD COLUMN "pdf_hash" text;--> statement-breakpoint
+ALTER TABLE "documents" ADD COLUMN "signed_at" timestamp;--> statement-breakpoint
+ALTER TABLE "audit_events" ADD CONSTRAINT "audit_events_document_id_documents_id_fk" FOREIGN KEY ("document_id") REFERENCES "public"."documents"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "signing_tokens" ADD CONSTRAINT "signing_tokens_document_id_documents_id_fk" FOREIGN KEY ("document_id") REFERENCES "public"."documents"("id") ON DELETE cascade ON UPDATE no action;