Consolidate database schema into two files: init migrations table and complete schema

Since there is no existing installed base, we can consolidate all migrations into a single complete schema file plus the migrations table initialization. This simplifies the database setup for new installations.

BUGS.md

@@ -0,0 +1,180 @@
+# Bugs in µPaaS
+
+## 1. Potential Race Condition in Log Writing
+
+### Description
+In the deployment service, when a deployment fails, the `failDeployment` function calls `writeLogsToFile` which may be called concurrently with the async log writer's flush operations. This could lead to partial or corrupted log files.
+
+### Location
+`internal/service/deploy/deploy.go:1169` in `failDeployment` function
+
+### Proposed Fix
+1. Add synchronization to ensure only one log write operation occurs at a time
+2. Modify the `deploymentLogWriter` to track completion status and prevent concurrent writes
+3. Add a wait mechanism in `failDeployment` to ensure any ongoing flush operations complete before writing logs to file
+
+```go
+// Add a mutex to deploymentLogWriter
+type deploymentLogWriter struct {
+    // existing fields...
+    mu         sync.Mutex
+    writeMu    sync.Mutex  // Add this for file writing synchronization
+    done       chan struct{}
+    flushed    sync.WaitGroup
+}
+
+// In writeLogsToFile, ensure exclusive access
+func (svc *Service) writeLogsToFile(app *models.App, deployment *models.Deployment) {
+    svc.writeMu.Lock()  // Add this mutex to Service struct
+    defer svc.writeMu.Unlock()
+    // existing code...
+}
+```
+
+## 2. Incomplete Error Handling in Container Operations
+
+### Description
+In the Docker client's `performClone` function, if `createGitContainer` fails, the SSH key file created earlier is not cleaned up, causing a potential security risk.
+
+### Location
+`internal/docker/client.go:597` in `performClone` function
+
+### Proposed Fix
+Add proper cleanup using `defer` immediately after creating the SSH key file:
+
+```go
+// After writing SSH key file (line 578)
+keyFileCreated := false
+err = os.WriteFile(cfg.keyFile, []byte(cfg.sshPrivateKey), sshKeyPermissions)
+if err != nil {
+    return nil, fmt.Errorf("failed to write SSH key: %w", err)
+}
+keyFileCreated = true
+
+defer func() {
+    if keyFileCreated {
+        removeErr := os.Remove(cfg.keyFile)
+        if removeErr != nil {
+            c.log.Error("failed to remove SSH key file", "error", removeErr)
+        }
+    }
+}()
+```
+
+## 3. Missing Context Cancellation Check During Build
+
+### Description
+In the deployment service's `streamBuildOutput` function, long-running Docker build operations may not properly respond to context cancellation, causing deployments to hang even when cancelled.
+
+### Location
+`internal/docker/client.go:542` in `streamBuildOutput` function
+
+### Proposed Fix
+Add context checking in the scanner loop:
+
+```go
+for scanner.Scan() {
+    select {
+    case <-ctx.Done():
+        return ctx.Err()
+    default:
+    }
+    
+    line := scanner.Bytes()
+    // existing code...
+}
+```
+
+## 4. Inconsistent Container Removal in Error Cases
+
+### Description
+When deployment fails during container creation, the already-created container is not removed, leading to orphaned containers that consume resources.
+
+### Location
+`internal/service/deploy/deploy.go:969` in `createAndStartContainer` function
+
+### Proposed Fix
+Add cleanup of created container on start failure:
+
+```go
+containerID, err := svc.docker.CreateContainer(ctx, containerOpts)
+if err != nil {
+    svc.notify.NotifyDeployFailed(ctx, app, deployment, err)
+    svc.failDeployment(ctx, app, deployment, fmt.Errorf("failed to create container: %w", err))
+    return "", fmt.Errorf("failed to create container: %w", err)
+}
+
+// Add cleanup defer for error cases
+defer func() {
+    if err != nil {
+        // If we have a container ID but returning an error, clean it up
+        _ = svc.docker.RemoveContainer(context.Background(), containerID, true)
+    }
+}()
+
+startErr := svc.docker.StartContainer(ctx, containerID)
+if startErr != nil {
+    svc.notify.NotifyDeployFailed(ctx, app, deployment, startErr)
+    svc.failDeployment(ctx, app, deployment, fmt.Errorf("failed to start container: %w", startErr))
+    err = startErr  // Set err so defer cleanup runs
+    return "", fmt.Errorf("failed to start container: %w", startErr)
+}
+```
+
+## 5. Potential Data Race in Active Deployments Tracking
+
+### Description
+The `activeDeploys` sync.Map in the deployment service may have race conditions when multiple concurrent deployments try to access the same app's deployment state.
+
+### Location
+`internal/service/deploy/deploy.go:226` and related functions
+
+### Proposed Fix
+Add proper locking around active deploy operations:
+
+```go
+// Add a mutex for active deploy operations
+type Service struct {
+    // existing fields...
+    activeDeployMu sync.Mutex
+}
+
+// In Deploy function
+func (svc *Service) Deploy(ctx context.Context, app *models.App, webhookEventID *int64, cancelExisting bool) error {
+    svc.activeDeployMu.Lock()
+    if cancelExisting {
+        svc.cancelActiveDeploy(app.ID)
+    }
+    
+    // Try to acquire per-app deployment lock
+    if !svc.tryLockApp(app.ID) {
+        svc.activeDeployMu.Unlock()
+        svc.log.Warn("deployment already in progress", "app", app.Name)
+        return ErrDeploymentInProgress
+    }
+    svc.activeDeployMu.Unlock()
+    
+    defer svc.unlockApp(app.ID)
+    // rest of function...
+}
+```
+
+## 6. Incomplete Error Propagation in Git Clone
+
+### Description
+In the Docker client's `runGitClone` function, if `ContainerLogs` fails, the error is silently ignored, which could hide important debugging information.
+
+### Location
+`internal/docker/client.go:679` in `runGitClone` function
+
+### Proposed Fix
+Handle the ContainerLogs error properly:
+
+```go
+// Always capture logs for the result
+logs, logErr := c.ContainerLogs(ctx, containerID, "100")
+if logErr != nil {
+    c.log.Warn("failed to get git clone logs", "error", logErr)
+    logs = "Failed to retrieve logs: " + logErr.Error()
+}
+```