jiff for table definition added

common/proto/auth.proto

@@ -8,6 +8,7 @@ service AuthService {
   rpc Register(RegisterRequest) returns (AuthResponse);
   rpc Login(LoginRequest) returns (LoginResponse);
   rpc GetAuthorization(GetAuthorizationRequest) returns (AuthorizationSnapshot);
+  rpc SetTimezone(SetTimezoneRequest) returns (UserPreferences);
 }
 
 message RegisterRequest {
@@ -38,6 +39,15 @@ message LoginResponse {
   string role = 5; // User's role
   string username = 6;
   AuthorizationSnapshot authorization = 7;
+  string timezone = 8;
+}
+
+message SetTimezoneRequest {
+  string timezone = 1; // IANA timezone, for example Europe/Bratislava
+}
+
+message UserPreferences {
+  string timezone = 1;
 }
 
 message GetAuthorizationRequest {}

common/proto/table_definition.proto

@@ -120,11 +120,16 @@ message ColumnDefinition {
   // Logical column type. Supported values (case-insensitive):
   //   TEXT
   //   BOOLEAN
-  //   TIMESTAMPTZ
+  //   INSTANT (absolute timestamp, displayed in the viewer timezone)
+  //   USER_DATETIME (local input resolved in the user's timezone)
+  //   RAW_DATETIME (timezone-free civil datetime)
+  //   TIME (timezone-free time of day)
   //   MONEY (= unconstrained NUMERIC; currency comes from the table)
   //   INT
   //   BIGINT
   //   DATE
+  //   DURATION
+  //   PERIOD
   //   DECIMAL(p,s) → NUMERIC(p,s)
   // DECIMAL args must be integers (no sign, no dot, no leading zeros);
   // s ≤ p and p ≥ 1.