[*] migrate to single table architecture

Author: pashagolub

.gitignore

@@ -82,3 +82,10 @@ dist/
 *.bak
 *.backup
 *.orig
+
+#  Spec-kit files
+templates/
+specs/
+memory/
+scripts/
+.github/prompts/

README.md

@@ -0,0 +1,27 @@
+# etcd_fdw - Bidirectional Synchronization
+
+## Overview
+
+etcd_fdw provides bidirectional synchronization between etcd and PostgreSQL using a single table architecture with revision status encoding.
+
+## Architecture
+
+- **Single Table**: All data stored in `etcd` table with revision-based synchronization status
+- **Revision Encoding**: `-1` = pending sync to etcd, `>0` = synchronized from etcd  
+- **Polling Mechanism**: PostgreSQL to etcd sync uses configurable polling interval
+
+## Installation
+
+```bash
+go install github.com/cybertec-postgresql/etcd_fdw/cmd/etcd_fdw@latest
+```
+
+## Usage
+
+```bash
+# Basic usage
+etcd_fdw --postgres-dsn="postgres://user:pass@localhost/db" --etcd-dsn="etcd://localhost:2379/prefix"
+
+# With custom polling interval
+etcd_fdw --postgres-dsn="..." --etcd-dsn="..." --polling-interval=2s
+```

cmd/etcd_fdw/cli_test.go

@@ -27,9 +27,10 @@ func TestCLIParsing(t *testing.T) {
 			},
 			wantErr: false,
 			expected: Config{
-				PostgresDSN: "postgres://user:pass@localhost:5432/db",
-				EtcdDSN:     "etcd://localhost:2379/",
-				LogLevel:    "info", // default value
+				PostgresDSN:     "postgres://user:pass@localhost:5432/db",
+				EtcdDSN:         "etcd://localhost:2379/",
+				LogLevel:        "info", // default value
+				PollingInterval: "1s",   // default value
 			},
 		},
 		{
@@ -40,27 +41,20 @@ func TestCLIParsing(t *testing.T) {
 			},
 			wantErr: false,
 			expected: Config{
-				PostgresDSN: "postgres://user:pass@localhost:5432/db",
-				EtcdDSN:     "etcd://localhost:2379,localhost:2380,localhost:2381/",
-				LogLevel:    "info", // default value
-			},
-		},
-		{
-			name:    "help flag",
-			args:    []string{"--help"},
-			wantErr: false,
-			expected: Config{
-				Help:     true,
-				LogLevel: "info", // default value
+				PostgresDSN:     "postgres://user:pass@localhost:5432/db",
+				EtcdDSN:         "etcd://localhost:2379,localhost:2380,localhost:2381/",
+				LogLevel:        "info", // default value
+				PollingInterval: "1s",   // default value
 			},
 		},
 		{
 			name:    "version flag",
 			args:    []string{"--version"},
 			wantErr: false,
 			expected: Config{
-				Version:  true,
-				LogLevel: "info", // default value
+				Version:         true,
+				LogLevel:        "info", // default value
+				PollingInterval: "1s",   // default value
 			},
 		},
 		{
@@ -71,12 +65,12 @@ func TestCLIParsing(t *testing.T) {
 				"--log-level", "debug",
 				"--dry-run",
 			},
-			wantErr: false,
+			wantErr: true, // dry-run not implemented
 			expected: Config{
-				PostgresDSN: "postgres://user:pass@localhost:5432/db",
-				EtcdDSN:     "etcd://localhost:2379/",
-				LogLevel:    "debug",
-				DryRun:      true,
+				PostgresDSN:     "postgres://user:pass@localhost:5432/db",
+				EtcdDSN:         "etcd://localhost:2379/",
+				LogLevel:        "debug",
+				PollingInterval: "1s", // default value
 			},
 		},
 		{
@@ -87,9 +81,10 @@ func TestCLIParsing(t *testing.T) {
 			},
 			wantErr: false,
 			expected: Config{
-				PostgresDSN: "postgres://user:pass@localhost:5432/db",
-				EtcdDSN:     "etcd://localhost:2379/config/?tls=enabled&dial_timeout=5s",
-				LogLevel:    "info", // default value
+				PostgresDSN:     "postgres://user:pass@localhost:5432/db",
+				EtcdDSN:         "etcd://localhost:2379/config/?tls=enabled&dial_timeout=5s",
+				LogLevel:        "info", // default value
+				PollingInterval: "1s",   // default value
 			},
 		},
 		{
@@ -101,9 +96,10 @@ func TestCLIParsing(t *testing.T) {
 			},
 			wantErr: false,
 			expected: Config{
-				PostgresDSN: "postgres://user:pass@localhost:5432/db",
-				EtcdDSN:     "etcd://localhost:2379/",
-				LogLevel:    "warn",
+				PostgresDSN:     "postgres://user:pass@localhost:5432/db",
+				EtcdDSN:         "etcd://localhost:2379/",
+				LogLevel:        "warn",
+				PollingInterval: "1s", // default value
 			},
 		},
 	}