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• User:

  erDiagram
    user {
      uuid userId PK "Bind with Supabase"
      varchar(20) userName UK "Index"
      nvarchar fullName
      char(12) citizenId
      date birthDay
      text pin "Hashed"
      bytea avatar "Optional, fallback OAuth image"
      text address "Optional"
      text email "Optional"
      char(10) phoneNumber "Optional"
    }
  
    source {
      varchar(20) sourceId PK "User choice"
      uuid userId FK
      money balance "Default 0, >= 0"
    }
  
    method {
      %% Non-renewal, principal rollover, principal & interest rollover
      varchar(3) methodId "Seed(NR, PR, PIR)"
    }
  
    interest_rate {
      serial interestRateId PK "Auto inc"
      int planId FK
      date definedDate
      decimal rate
    }
  
    ticket {
      uuid ticketId PK
      int sourceId FK
      int methodId FK
      %% So what if I changed and there're other ... already, will be failed
      money initMoney ">= settings[minimumInitMoney] when insert"
      %% Calculate before return to client (not in DB)?
      date createdAt "Default now"
      date closedDate "Nullable, defined later"
    }
  
    %% Use latest plan
    %% The name is ambiguous
    ticket_interest_rate {
      uuid ticketId PK,FK
      int interestRateId FK
      date issueDate PK "= ticket[createdAt] + 1 || prev[issueDate] + 1"
      date maturityDate "= issueDate + plan[days]"
    }
  
    plan {
      serial planId PK "Auto inc"
      int days UK ">= -1, Seed(-1, 90, 180)"
      boolean isDisabled
      serial latestInterestRate FK "Nullable"
    }
  
    transaction {
      uuid transactionId PK
      int sourceId FK
      money amount "> 0"
      enum type "deposit, withdraw, interest_payment"
      timestamp createdAt "Default now"
    }
  
    notification {
      serial notificationId PK
      uuid userId FK "Index"
      nvarchar title
      text content
      timestamp createdAt "Default now"
    }
  
    source }o--|| transaction : "has"
    user }o--|| notification : "has"
    user }|--|| source : "has"
    source }o--|| ticket : "has"
    ticket ||--o{ method : "has"
    ticket }|--|| ticket_interest_rate : "has sequential"
    plan }o--|| interest_rate : "has history"
    ticket_interest_rate ||--}o interest_rate : "has latest"
  

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• Admin related stuff

  erDiagram
    statistic {
        date date
        int users "Σ user"
        int tickets
        money deposits "Σ ticket[initMoney]"
      }
  
      settings {
        money minimumInitMoney
      }
  
      admin {
        nvarchar username PK,UK
        text password "Hashed"
      }
  

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Backend:

• Ticket:
  • Return paidInterest = initMoney * interest_rate[rate] / 100"
  • Return anticipatedInterest is when instantly settle (latest interest_rate[rate] where plan[days=-1])

architecture-beta
  group supabase[Supabase]
  service authentication_server(server)[Authenticate Server] in supabase
  service database(database)[Database] in supabase

  group own_server[Own Server]
  service api_server(server)[API] in own_server
  service admin_web_server(server)[Admin Web] in own_server

  group firebase[Firebase]
  service fcm(server)[FCM] in firebase

  group ai_server[AI Server]
  service api_ai(server)[API] in ai_server

  junction junction_bot_left

  service mobile[Mobile]
  service admin[Admin]

  api_server:L -- R:authentication_server{group}
  authentication_server:L -- R:database

  admin_web_server:L -- R:api_server

  fcm{group}:R -- L:junction_bot_left

  api_ai{group}:B -- T:api_server

  admin:T -- B:admin_web_server

  mobile:T -- B:api_server
  mobile:L -- R:junction_bot_left
  junction_bot_left:T -- B:authentication_server{group}