chore: initialize SkyMoney (api + prisma + docker-compose) ( still in progress

api/prisma/schema.prisma

@@ -0,0 +1,87 @@
+// prisma/schema.prisma 
+generator client { provider = "prisma-client-js" }
+datasource db { provider = "postgresql"; url = env("DATABASE_URL") }
+
+model User {
+  id        String   @id @default(uuid())
+  email     String   @unique
+  createdAt DateTime @default(now())
+
+  variableCategories VariableCategory[]
+  fixedPlans         FixedPlan[]
+  incomes            IncomeEvent[]
+  allocations        Allocation[]
+  transactions       Transaction[]
+}
+
+model VariableCategory {
+  id           String  @id @default(uuid())
+  userId       String
+  user         User    @relation(fields: [userId], references: [id], onDelete: Cascade)
+  name         String
+  percent      Int
+  priority     Int     @default(100)
+  isSavings    Boolean @default(false)
+  balanceCents BigInt  @default(0)
+
+  @@unique([userId, name])
+  @@check(percent_gte_0,  "percent >= 0")
+  @@check(percent_lte_100,"percent <= 100")
+}
+
+model FixedPlan {
+  id          String  @id @default(uuid())
+  userId      String
+  user        User    @relation(fields: [userId], references: [id], onDelete: Cascade)
+  name        String
+  cycleStart  DateTime
+  dueOn       DateTime
+  totalCents  BigInt
+  fundedCents BigInt  @default(0)
+  priority    Int     @default(100)
+  fundingMode String  @default("auto-on-deposit") // or 'by-schedule'
+  scheduleJson Json?
+
+  @@unique([userId, name])
+  @@check(total_nonneg,     "totalCents >= 0")
+  @@check(funded_nonneg,    "fundedCents >= 0")
+}
+
+model IncomeEvent {
+  id          String   @id @default(uuid())
+  userId      String
+  user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  postedAt    DateTime
+  amountCents BigInt
+
+  allocations Allocation[]
+
+  @@check(pos_amount, "amountCents > 0")
+}
+
+model Allocation {
+  id          String   @id @default(uuid())
+  userId      String
+  user        User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  createdAt   DateTime @default(now())
+  kind        String   // 'savings' | 'variable' | 'fixed'
+  toId        String
+  amountCents BigInt
+  incomeId    String?
+  income      IncomeEvent? @relation(fields: [incomeId], references: [id])
+
+  @@check(pos_amount, "amountCents > 0")
+}
+
+model Transaction {
+  id           String   @id @default(uuid())
+  userId       String
+  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  occurredAt   DateTime
+  kind         String   // 'variable-spend' | 'fixed-payment'
+  categoryId   String?
+  planId       String?
+  amountCents  BigInt
+
+  @@check(pos_amount, "amountCents > 0")
+}