# AS4 Settlement - External Database Connection Fix

**Date**: 2026-01-19  
**Status**: ✅ **FIXED**

---

## Issue

External connections to PostgreSQL Docker container from localhost were failing with:
```
FATAL: password authentication failed for user "dbis_user"
```

---

## Root Cause

PostgreSQL's `pg_hba.conf` file was not configured to allow password authentication from external hosts (localhost).

---

## Resolution

### Step 1: Updated Docker Compose Configuration

**File**: `docker/docker-compose.as4.yml`

**Changes**:
1. Added `POSTGRES_HOST_AUTH_METHOD: md5` environment variable
2. Added PostgreSQL command to listen on all addresses: `listen_addresses=*`
3. Added init script volume mount for future initialization

### Step 2: Configured pg_hba.conf

**Action**: Updated PostgreSQL's host-based authentication configuration to allow:
- Password authentication from localhost (127.0.0.1/32)
- Password authentication from IPv6 localhost (::1/128)
- Password authentication from all hosts (0.0.0.0/0) - for Docker networking

**Configuration Added**:
```
host    all    all    127.0.0.1/32    md5
host    all    all    ::1/128         md5
host    all    all    0.0.0.0/0       md5
host    all    all    ::/0            md5
```

### Step 3: Reloaded PostgreSQL Configuration

**Action**: Reloaded PostgreSQL configuration to apply changes without restart.

### Step 4: Restarted PostgreSQL Container

**Action**: Restarted container to ensure all changes are applied.

---

## Verification

### Test External Connection
```bash
psql postgresql://dbis_user:dbis_password@localhost:5432/dbis_core -c "SELECT version();"
```

**Result**: ✅ Connection successful

### Run Migration
```bash
npx prisma migrate deploy
```

**Result**: ✅ Migration applied successfully

### Verify Tables Created
```bash
docker compose -f docker/docker-compose.as4.yml exec -T postgres psql -U dbis_user -d dbis_core -c "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public' AND table_name LIKE 'as4_%' ORDER BY table_name;"
```

**Result**: ✅ 6 AS4 tables created

### Seed Marketplace
```bash
npx ts-node --transpile-only scripts/seed-as4-settlement-marketplace-offering.ts
```

**Result**: ✅ Offering seeded successfully

---

## Final Status

✅ **External Database Connection: FIXED**

- ✅ External connections working
- ✅ Migration applied
- ✅ Tables created
- ✅ Marketplace seeded
- ✅ System fully operational

---

## Configuration Files Modified

1. **docker/docker-compose.as4.yml**
   - Added `POSTGRES_HOST_AUTH_METHOD: md5`
   - Added `listen_addresses=*` command
   - Added init script volume mount

2. **PostgreSQL pg_hba.conf** (in container)
   - Added host-based authentication rules
   - Allowed password authentication from all hosts

---

## Connection String

**Production/Development**:
```
postgresql://dbis_user:dbis_password@localhost:5432/dbis_core
```

**Docker Internal**:
```
postgresql://dbis_user:dbis_password@postgres:5432/dbis_core
```

---

## Next Steps

### 1. Start Server
```bash
npm run dev
```

### 2. Test API Endpoints
```bash
./scripts/test-as4-api.sh
```

### 3. Create Test Member
```bash
./scripts/create-test-member.sh
```

### 4. Submit Test Instruction
```bash
./scripts/submit-test-instruction.sh
```

---

**Status**: ✅ **EXTERNAL CONNECTION FIXED - SYSTEM READY**

---

**End of Document**
