Add index on chanid in iptv_channel and channelgroup (#991)

The tables iptv_channel and channelgroup are accessed via
the chanid but there was no index on chanid in both tables.
Having these indices greatly speeds up the start of playback,
both for recordings and for live TV, when there is a large
number of channels available in various video sources.
This is influenced by the automatic creation of
channelgroups per video source when there is more than
one video source present in the system.

mythtv/bindings/perl/MythTV.pm

@@ -116,7 +116,7 @@ package MythTV;
 # schema version supported in the main code.  We need to check that the schema
 # version in the database is as expected by the bindings, which are expected
 # to be kept in sync with the main code.
-    our $SCHEMA_VERSION = "1381";
+    our $SCHEMA_VERSION = "1382";
 
 # NUMPROGRAMLINES is defined in mythtv/libs/libmythtv/programinfo.h and is
 # the number of items in a ProgramInfo QStringList group used by

mythtv/bindings/python/MythTV/_versions.py.in

@@ -7,7 +7,7 @@ The file MythTV/_versions.py is usually generated by ./configure.
 """
 
 OWN_VERSION = @MYTHTV_PYTHON_OWN_VERSION@
-SCHEMA_VERSION = 1381
+SCHEMA_VERSION = 1382
 NVSCHEMA_VERSION = 1007
 MUSICSCHEMA_VERSION = 1025
 PROTO_VERSION = '91'

mythtv/libs/libmythbase/mythversion.h.in

@@ -76,7 +76,7 @@ static constexpr const char* MYTH_PROTO_TOKEN { "BuzzOff" };
  *      mythtv/bindings/php/MythBackend.php
  */
 
-static constexpr const char* MYTH_DATABASE_VERSION { "1381" };
+static constexpr const char* MYTH_DATABASE_VERSION { "1382" };
 
 MBASE_PUBLIC  const char *GetMythSourceVersion();
 MBASE_PUBLIC  const char *GetMythSourcePath();

mythtv/libs/libmythtv/dbcheck.cpp

@@ -4074,6 +4074,17 @@ static bool doUpgradeTVDatabaseSchema(void)
             return false;
     }
 
+    if (dbver == "1381")
+    {
+        DBUpdates updates {
+            "ALTER TABLE iptv_channel ADD INDEX (chanid);"
+            "ALTER TABLE channelgroup ADD INDEX (chanid);"
+        } ;
+        if (!performActualUpdate("MythTV", "DBSchemaVer",
+                                 updates, "1382", dbver))
+            return false;
+    }
+
     return true;
 }