diff --git a/.gitignore b/.gitignore
index b24d71e..ab618b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,50 +1,6 @@
-# These are some examples of commonly ignored file patterns.
-# You should customize this list as applicable to your project.
-# Learn more about .gitignore:
-#     https://www.atlassian.com/git/tutorials/saving-changes/gitignore
 
-# Node artifact files
-node_modules/
-dist/
-
-# Compiled Java class files
-*.class
-
-# Compiled Python bytecode
-*.py[cod]
-
-# Log files
-*.log
-
-# Package files
-*.jar
-
-# Maven
-target/
-dist/
-
-# JetBrains IDE
-.idea/
-
-# Unit test reports
-TEST*.xml
-
-# Generated by MacOS
-.DS_Store
-
-# Generated by Windows
-Thumbs.db
-
-# Applications
-*.app
-*.exe
-*.war
-
-# Large media files
-*.mp4
-*.tiff
-*.avi
-*.flv
-*.mov
-*.wmv
+.Rproj.user
+.Rhistory
+.RData
+.Ruserdata
 
diff --git a/R/accounts/accounts.R b/R/accounts/accounts.R
new file mode 100644
index 0000000..a098629
--- /dev/null
+++ b/R/accounts/accounts.R
@@ -0,0 +1,13 @@
+read_accounts <-  function(conn){
+  tbl(conn, "accounts")
+  
+} 
+
+
+get_account_choices <- function(conn) {
+  tbl(conn, "accounts") |>
+    select(id, konto) |>
+    collect() |>
+    arrange(konto) |>
+    (\(df) setNames(df$id, df$konto))()
+}
diff --git a/R/buchungen/buchungen.R b/R/buchungen/buchungen.R
new file mode 100644
index 0000000..de8ef24
--- /dev/null
+++ b/R/buchungen/buchungen.R
@@ -0,0 +1,21 @@
+read_buch_tabelle <- function(conn){
+  postings <- tbl(conn, "postings")
+  entries  <- tbl(conn, "entries")
+  accounts <- tbl(conn, "accounts")
+  projects <- tbl(conn, "projects")
+  contacts <- tbl(conn, "contacts")
+  result <- postings |>
+    left_join(entries,  by = c("entry_id" = "id")) |>
+    left_join(contacts, by = c("contact_id" = "id")) |>  # contact_id jetzt verfügbar
+    left_join(accounts, by = c("account_id" = "id")) |>
+    left_join(projects, by = c("project_id" = "id")) |>
+    select(id, valuta, konto, projektname, display_name,  amount, entry_id) |>
+    collect() 
+}
+
+read_posting <- function(conn, id){
+  dbxSelect(conn, paste0("SELECT * FROM postings WHERE id =", id))
+}
+read_postings_by_entry <- function(conn, id){
+  dbxSelect(conn, paste0("SELECT * FROM postings WHERE entry_id =", id))
+}
diff --git a/R/buchungen_mod.R b/R/buchungen_mod.R
new file mode 100644
index 0000000..c335c3e
--- /dev/null
+++ b/R/buchungen_mod.R
@@ -0,0 +1,92 @@
+buchungenUI <- function(id) {
+  ns <- NS(id)
+  tagList(
+    reactableOutput(ns("buchungen_table"))
+  )
+}
+
+buchungenServer <- function(id) {
+  moduleServer( id, function(input, output, session) {
+    ns <- session$ns 
+    
+    postings <- reactiveVal(read_buch_tabelle(conn))
+
+    
+    output$buchungen_table <- renderReactable({
+      reactable(
+        postings(),
+        onClick = "expand",
+        selection = "single", 
+        details = function(index) {
+          entry_id <- postings()$entry_id[index]
+          detail_rows <- postings()[postings()$entry_id == entry_id, ]
+          
+          div(
+            style = "padding: 10px; background: #f4f4f4; border-left: 4px solid #3c8dbc; max-width: 800px; margin-left: auto",
+            
+            reactable(
+              dplyr::select(detail_rows, konto, projektname, amount),
+              fullWidth = TRUE,
+              columns = list(
+                konto          = colDef(name = "Konto",     minWidth = 150),
+                projektname        = colDef(name = "Projekt",       minWidth = 150),
+                amount         = colDef(name = "Betrag",        minWidth = 80)
+              )
+            )
+          )
+        },
+        columns = list(
+          id = colDef(name = "ID", minWidth = 80),
+          valuta = colDef(name = "Wertstellung", minWidth = 80),
+          konto = colDef(name = "Kontoname", minWidth = 200),
+          entry_id = colDef(show = FALSE)
+        )
+      )
+    })
+    
+    # Modal zum editieren
+    selected <- reactive(getReactableState("buchungen_table", "selected"))
+    observeEvent(selected(),{
+      idwert <- postings()[selected(), "id"]
+      selected_row <- read_posting(conn, idwert) %>%
+        mutate(verzicht = ifelse(is.na(verzicht), F, verzicht))
+      showModal(modalDialog(
+        title = "Buchung bearbeiten",
+        size = "l",
+        tags$style(HTML(".modal-dialog { max-width: 90% !important; width: 90% !important; }")),
+        
+        entryEditUI(ns("entry_edit")),
+        footer = tagList(
+          modalButton("Abbrechen"),
+          actionButton(ns("speichern"), "Speichern")
+        )
+      ))
+      
+      entryEditServer("entry_edit", entry_id = selected_row$entry_id, conn = conn)
+      
+    }, ignoreInit = TRUE)
+    
+    observeEvent(input$speichern, {
+      browser()
+      dbExecute(conn, "UPDATE postings SET 
+    account_id = ?, project_id = ?, amount = ?, valuta = ?,
+    notiz = ?, rechnungsnummer = ?, betrag_muenzen = ?, verzicht = ?
+    WHERE id = ?",
+        params = list(
+          input$account_id, input$project_id, input$amount, input$valuta,
+          input$notiz, input$rechnungsnummer, input$betrag_muenzen, input$verzicht,
+          selected_row$id
+        )
+      )
+      
+      removeModal()
+      buchungen(read_buch_tabelle(conn))  # Tabelle neu laden
+    })
+    
+    
+    
+    
+    
+  }
+  )
+}
\ No newline at end of file
diff --git a/R/contacts/contacts.R b/R/contacts/contacts.R
new file mode 100644
index 0000000..63b155f
--- /dev/null
+++ b/R/contacts/contacts.R
@@ -0,0 +1,8 @@
+
+get_contact_choices <- function(conn) {
+  tbl(conn, "contacts") |>
+    select(id, display_name) |>
+    collect() |>
+    arrange(display_name) |>
+    (\(df) setNames(df$id, df$display_name))()
+}
diff --git a/R/entries/entries.R b/R/entries/entries.R
new file mode 100644
index 0000000..0660fec
--- /dev/null
+++ b/R/entries/entries.R
@@ -0,0 +1,3 @@
+read_entry <- function(conn, idwert) {
+  dbxSelect(conn, paste0("SELECT * FROM entries WHERE id=", idwert))
+}
\ No newline at end of file
diff --git a/R/entry_edit_modal.R b/R/entry_edit_modal.R
new file mode 100644
index 0000000..51bf23b
--- /dev/null
+++ b/R/entry_edit_modal.R
@@ -0,0 +1,93 @@
+# entry_edit_mod.R
+entryEditUI <- function(id) {
+  ns <- NS(id)
+  tagList(
+    
+    uiOutput(ns("entry_ui")),
+    uiOutput(ns("postings_ui"))
+  )
+}
+
+entryEditServer <- function(id, entry_id, conn) {
+  moduleServer(id, function(input, output, session) {
+    ns <- session$ns
+    
+    entry_postings <- reactiveVal(read_postings_by_entry(conn, entry_id))
+    entry_data     <- reactiveVal(read_entry(conn, entry_id))
+    
+    output$entry_ui <- renderUI({
+      e <- entry_data()
+      tagList(
+        fluidRow(
+          column(6, selectizeInput(ns("contact_id"), "Kontakt", 
+            choices = get_contact_choices(conn),
+            selected = e$contact_id)),
+          column(6, textInput(ns("purpose"), "Verwendungszweck", value = e$purpose))
+        ),
+        hr()
+      )
+    })
+    
+    # Choices für contact nach dem Flush setzen
+    
+    
+    output$postings_ui <- renderUI({
+      alle <- entry_postings()
+      lapply(seq_len(nrow(alle)), function(i) {
+        print(paste("project selected:", alle$project_id[i]))
+        print(head(get_project_choices(conn)))
+        print(class(get_project_choices(conn)))
+        div(
+          style = "border-left: 3px solid #3c8dbc; padding: 5px; margin-bottom: 5px",
+          fluidRow(
+            column(3, 
+              selectInput(ns(paste0("account_id_", i)), "Konto", 
+                choices  = get_account_choices(conn),
+                selected = as.character(alle$account_id[i]))
+            ),
+            column(3, selectizeInput(ns(paste0("project_id_", i)), "Projekt", 
+              choices  = get_project_choices(conn),
+              selected = ifelse(is.na(alle$project_id[i]), "", as.character(alle$project_id[i])))
+            ),
+            column(2, numericInput(ns(paste0("amount_", i)),        "Betrag", value = alle$amount[i])),
+            column(3, textInput(ns(paste0("notiz_", i)),            "Notiz",  value = alle$notiz[i])),
+            column(1, actionButton(ns(paste0("delete_", i)), "", icon = icon("trash"), class = "btn-danger btn-sm"))
+          )
+        )
+      })
+    })
+    
+    # Choices befüllen nachdem renderUI fertig ist
+    observe({
+      alle <- entry_postings()
+      e    <- entry_data()
+      req(nrow(alle) > 0, nrow(e) > 0)
+      
+      session$onFlushed(function() {
+        # Contact
+        updateSelectizeInput(session, "contact_id",
+          choices  = get_contact_choices(conn),
+          selected = e$contact_id)
+        
+        # Postings
+        lapply(seq_len(nrow(alle)), function(i) {
+          updateSelectizeInput(session, paste0("account_id_", i),
+            choices  = get_account_choices(conn),
+            selected = alle$account_id[i])
+          updateSelectizeInput(session, paste0("project_id_", i),
+            choices  = get_project_choices(conn),
+            selected = alle$project_id[i])
+        })
+      }, once = TRUE)
+    })
+    
+    # Speichern-Logik
+    observeEvent(input$speichern, {
+      alle <- entry_postings()
+      lapply(seq_len(nrow(alle)), function(i) {
+        # update posting i in DB
+      })
+    })
+    
+  })
+}
\ No newline at end of file
diff --git a/R/projects/projects.R b/R/projects/projects.R
new file mode 100644
index 0000000..be8d57a
--- /dev/null
+++ b/R/projects/projects.R
@@ -0,0 +1,9 @@
+get_project_choices <- function(conn) {
+  projekte <- tbl(conn, "projects") |>
+    select(id, projektname) |>
+    collect() |>
+    arrange(projektname)
+  
+  choices <- setNames(as.character(projekte$id), projekte$projektname)
+  c("-" = "", choices)
+}
\ No newline at end of file
diff --git a/db/development.sqlite3 b/db/development.sqlite3
new file mode 100644
index 0000000..65a0603
Binary files /dev/null and b/db/development.sqlite3 differ
diff --git a/gemfin-shiny.Rproj b/gemfin-shiny.Rproj
new file mode 100644
index 0000000..8e3c2eb
--- /dev/null
+++ b/gemfin-shiny.Rproj
@@ -0,0 +1,13 @@
+Version: 1.0
+
+RestoreWorkspace: Default
+SaveWorkspace: Default
+AlwaysSaveHistory: Default
+
+EnableCodeIndexing: Yes
+UseSpacesForTab: Yes
+NumSpacesForTab: 2
+Encoding: UTF-8
+
+RnwWeave: Sweave
+LaTeX: pdfLaTeX
diff --git a/global.R b/global.R
new file mode 100644
index 0000000..b31571e
--- /dev/null
+++ b/global.R
@@ -0,0 +1,19 @@
+library("dbplyr")
+library("tidyverse")
+library("shiny")
+library("DBI")
+library("RSQLite")
+library("dbx")
+library("shinydashboard")
+library("reactable")
+library("conflicted")
+library("R.utils")
+
+conflicts_prefer(dplyr::select)
+conflicts_prefer(dplyr::filter)
+
+options(shiny.reactlog = TRUE)
+options(shiny.error = browser)
+
+conn <- dbConnect(RSQLite::SQLite(), "db/development.sqlite3")
+sourceDirectory("R/")
diff --git a/server.R b/server.R
new file mode 100644
index 0000000..a1cfc38
--- /dev/null
+++ b/server.R
@@ -0,0 +1,5 @@
+server <- function(input, output) {
+  
+  buchungenServer("buchungen_tab") 
+  
+}
diff --git a/ui.R b/ui.R
new file mode 100644
index 0000000..fb83fc7
--- /dev/null
+++ b/ui.R
@@ -0,0 +1,24 @@
+## ui.R ##
+dashboardPage(
+  dashboardHeader(),
+  ## Sidebar content
+  dashboardSidebar(
+    sidebarMenu(
+      menuItem("buchungen", tabName = "buchungen", icon = icon("dashboard")),
+      menuItem("konten", tabName = "Konten", icon = icon("th"))
+    )
+  ),
+ dashboardBody(
+    tabItems(
+      # First tab content
+      tabItem(tabName = "buchungen",
+        buchungenUI("buchungen_tab")
+      ),
+
+      # Second tab content
+      tabItem(tabName = "widgets",
+        h2("Widgets tab content")
+      )
+    )
+  )
+)