Fix high-severity issues: implement SSL and warn on raw-SQL filter

SSL was wired through the UI and ConnectionProfile but never actually
applied in any driver or passed from the connection builder.

- main_window: pass ssl/ssl_ca/ssl_cert/ssl_key from profile into
  the driver config dict so drivers can act on them
- MySQL: add ssl={ca,cert,key} to pymysql connect kwargs when enabled
- PostgreSQL: set sslmode=verify-ca (with CA) or require, plus
  sslrootcert/sslcert/sslkey when provided
- MSSQL: switch Encrypt=yes + TrustServerCertificate=no when SSL is
  on; Encrypt=no + TrustServerCertificate=yes otherwise
- SQLite: no change needed (local file, no network layer)

WHERE filter: add tooltip explicitly labelling the input as raw SQL
so users understand arbitrary expressions are executed directly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/drivers/mssql_driver.py

@@ -34,12 +34,20 @@ class MSSQLDriver(BaseDriver):
         installed = pyodbc.drivers() if PYODBC_AVAILABLE else []
         driver = next((d for d in preferred if d in installed), preferred[0])
 
+        if self.config.get("ssl"):
+            encrypt       = "yes"
+            trust_cert    = "no"
+        else:
+            encrypt       = "no"
+            trust_cert    = "yes"
+
         return (
             f"DRIVER={{{driver}}};"
             f"SERVER={host},{port};"
             f"DATABASE={db};"
             f"UID={user};PWD={pwd};"
-            f"TrustServerCertificate=yes;"
+            f"Encrypt={encrypt};"
+            f"TrustServerCertificate={trust_cert};"
             f"Connection Timeout={self.config.get('connection_timeout', 30)};"
         )
 

app/drivers/mysql_driver.py

@@ -31,6 +31,12 @@ class MySQLDriver(BaseDriver):
         db = self.config.get("database", "")
         if db:
             kw["database"] = db
+        if self.config.get("ssl"):
+            ssl_opts = {}
+            if self.config.get("ssl_ca"):   ssl_opts["ca"]   = self.config["ssl_ca"]
+            if self.config.get("ssl_cert"): ssl_opts["cert"] = self.config["ssl_cert"]
+            if self.config.get("ssl_key"):  ssl_opts["key"]  = self.config["ssl_key"]
+            kw["ssl"] = ssl_opts
         return kw
 
     def connect(self) -> None:

app/drivers/postgres_driver.py

@@ -26,6 +26,11 @@ class PostgreSQLDriver(BaseDriver):
         db = self.config.get("database", "")
         if db:
             kw["dbname"] = db
+        if self.config.get("ssl"):
+            kw["sslmode"] = "verify-ca" if self.config.get("ssl_ca") else "require"
+            if self.config.get("ssl_ca"):   kw["sslrootcert"] = self.config["ssl_ca"]
+            if self.config.get("ssl_cert"): kw["sslcert"]     = self.config["ssl_cert"]
+            if self.config.get("ssl_key"):  kw["sslkey"]      = self.config["ssl_key"]
         return kw
 
     def connect(self) -> None:

app/main_window.py

@@ -246,6 +246,10 @@ class MainWindow(QMainWindow):
             "user":               profile.username,
             "password":           profile.password,
             "connection_timeout": profile.connection_timeout,
+            "ssl":                profile.ssl,
+            "ssl_ca":             profile.ssl_ca,
+            "ssl_cert":           profile.ssl_cert,
+            "ssl_key":            profile.ssl_key,
         }
         _log.info("Connecting to '%s'  type=%s  host=%s",
                   profile.name, profile.db_type, profile.host)

app/ui/table_viewer.py

@@ -331,9 +331,13 @@ class TableViewer(QWidget):
         self._filter_input = QLineEdit()
         self._filter_input.setPlaceholderText("WHERE … (e.g.  id > 100)")
         self._filter_input.setFixedWidth(260)
+        self._filter_input.setToolTip(
+            "Raw SQL — injected directly into WHERE clause.\n"
+            "Examples:  id > 100    name LIKE 'A%'    status = 'active'"
+        )
         self._filter_btn = QPushButton("🔍")
         self._filter_btn.setFixedWidth(34)
-        self._filter_btn.setToolTip("Apply filter")
+        self._filter_btn.setToolTip("Apply filter (raw SQL WHERE clause)")
         self._filter_btn.clicked.connect(self._apply_filter)
         self._filter_input.returnPressed.connect(self._apply_filter)