feat: add DBStructure schema

frontend/packages/db-structure/src/schema/index.ts

@@ -1,9 +1,57 @@
 import * as v from 'valibot'
 
-const tablesSchema = v.object({})
+const fieldNameSchema = v.string()
+
+const tableNameSchema = v.string()
+
+const relationshipNameSchema = v.string()
+
+const fieldSchema = v.object({
+  name: fieldNameSchema,
+  type: v.string(),
+  default: v.string(),
+  check: v.string(),
+  primary: v.boolean(),
+  unique: v.boolean(),
+  notNull: v.boolean(),
+  increment: v.boolean(),
+  comment: v.string(),
+})
+
+const indexSchema = v.object({
+  name: v.string(),
+  unique: v.boolean(),
+  fields: v.array(v.string()),
+})
+
+const tableSchema = v.object({
+  name: tableNameSchema,
+  x: v.number(),
+  y: v.number(),
+  fields: v.array(fieldSchema),
+  comment: v.string(),
+  indices: v.array(indexSchema),
+  color: v.string(),
+})
+
+const relationshipSchema = v.object({
+  name: relationshipNameSchema,
+  startTableName: tableNameSchema,
+  startFieldName: fieldNameSchema,
+  endTableName: tableNameSchema,
+  endFieldName: fieldNameSchema,
+  cardinality: v.string(),
+  updateConstraint: v.string(),
+  deleteConstraint: v.string(),
+})
+
+const tablesSchema = v.record(tableNameSchema, tableSchema)
+
+const relationshipsSchema = v.record(relationshipNameSchema, relationshipSchema)
 
 export const dbStructureSchema = v.object({
   tables: tablesSchema,
+  relationships: relationshipsSchema,
 })
 
 export type DBStructure = v.InferOutput<typeof dbStructureSchema>